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The 8 Best moss and algae killers of 2025

Are you trying to find moss and algae killers among various brands on the market but aren’t sure where to begin? To assist you in finding the right one, we’ve put together a list of the 7 best to help you pick the perfect one!

We investigated and evaluated a number of the top-selling moss and algae killers on the market in order to create our list of the best. Making a decision among the many options available is never simple. There are an infinite number of models available, each with a distinct price. And as you’ll find out, the best options aren’t usually the ones you imagine! This comparison is rich and relevant because of the numerous factors that were employed. You will find products featured in this ranking not only based on their pricing but also on their features and other customers reviews. To write this review, we completed 19 hours of research and did 65 moss and algae killers tests. You won’t need to pick products at random any more. If you’re unsure of what to look for, browse our list and consult the buying guide!

An overview of our top picks

Table of contents

The best moss and algae killers you can buy today

No. 1
Bonide MossMax, 32 oz Ready-to-Spray Control for Algae, Moss and Lichens, Outdoor Home and Garden Use, Nonstaining Formula
  • KILLS MOSS - MossMax quickly kills lawn moss, giving your lawn grass the opportunity to fill in & reclaim the lawn. Enjoy a beautiful moss free lawn!
  • FAST ACTING-Kills actively growing moss and algae within hours.
  • PROMOTES A GREEN LAWN - MossMax Lawn Granules not only kills lawn moss quickly, it also turns lawns a deep green.
  • USE ON STRUCTURAL SURFACES-Can also be used on surfaces such as roofs, decks, patios, sidewalks and fences. Does not stain concrete or other surfaces.
  • EASY TO APPLY - Product instantly mixes with water and should be applied as a spray using a mist blower, hose-end sprayer or pressurized hand sprayer. Product can be applied up to the day of harvest.
No. 2
Safer Brand 5324-6 Moss and Algae Killer and Surface Cleaner, 32 oz. Hose Sprayer
  • This moss and algae killer utilizes the effectiveness of potassium salts to rid your deck, roof, siding, walkways, lawn and more of algae and moss
  • Ready-to-use formula attaches directly to your hose for an economical and convenient solution
  • Kills algae and mosses
  • OMRI listed for organic use
SaleNo. 3
Scotts MossEx 3-in-1 Ready-Spray, Moss Killer for Lawns, Hard Surfaces, and More, 32 fl. oz.
  • Scotts MossEx 3-in-1 Ready-Spray is a fast and effective way to control mosses, algae, lichens, and liverworts
  • This liquid treatment is non-staining and kills moss within hours
  • Connect the sprayer to a garden hose and spray any time during the year
  • For use on lawns, ornamental gardens, around homes and on roofs, patios, decks, sidewalks, and more (as listed)
  • One 32 fl. oz. bottle of Scotts MossEx 3-in-1 Ready-Spray treats up to 500 sq. ft.
SaleNo. 4
Wet & Forget Outdoor Moss, Mold, Mildew, & Algae Stain Remover Multi-Surface Cleaner, Xtreme Reach Hose End with New & Improved Nozzle, 48 Fluid Ounces
  • New & Improved Nozzle! Xtreme Reach Hose End Outdoor Cleaner attaches to garden hose; jet tip sprays up to 30ft to remove green and black stains caused by moss, mold, mildew, and algae on roofs and siding; fan tip provides quick application to driveways and decks; no rinsing
  • Spray dry surface on a cool day to avoid rapid evaporation of product, do not rinse, apply when rain is not forecasted within 4-5 hours, apply when the temperature is above 55° F
  • Cleans over time with the wind and rain, green stains clean up within 1-2 weeks, black stains or heavy, stubborn stains can take several months, long-established stains may take 6-12 months; surfaces can stay clean up to 1 year or longer
  • It is bleach free and non-acidic; spray 100 feet away from lakes, ponds, rivers, and streams and flush plants with water before and after application
  • Each bottle has an unlimited shelf life and treats up to 2,000 square feet, heavy stained and porous surfaces will absorb more product
No. 5
Wet & Forget Outdoor Moss, Mold, Mildew, & Algae Stain Remover Multi-Surface Cleaner, Ready to Use, 64 Ounce
  • Wet & Forget Ready To Use Outdoor Cleaner comes with a high-capacity trigger sprayer for quick application to smaller surfaces; removes green and black stains caused by moss, mold, mildew, and algae, no scrubbing, no rinsing, no pressure washing, just wet it and forget it on multiple surfaces including, porch steps, headstones, fountains, planters, concrete, canvas, and upholstery
  • Use attached sprayer apply generously to dry surface on a cool day to avoid rapid evaporation of product, do not rinse, apply when rain is not forecasted within 4-5 hours, apply when the temperature is above 32° F
  • Cleans over time with the wind and rain, green stains clean up within 1-2 weeks, black stains or heavy, stubborn stains can take several months, long-established stains may take 6-12 months; surfaces can stay clean up to 1 year or longer
  • It is bleach free and non-acidic; spray 100 feet away from lakes, ponds, rivers, and streams and flush plants with water before and after application
  • Each bottle has an unlimited shelf life and treats 60 - 180 square feet, heavy stained and porous surfaces will absorb more product
SaleNo. 6
CENTRAL GARDEN BRANDS Lilly Miller Moss Out for Lawns Ready to Spray 32oz, 1-(Pack)
  • Kills lawn moss quickly
  • Works in Hours.
  • Liquid iron gives superior results
SaleNo. 7
30 SECONDS Mold and Mildew Stain Remover Concentrate | Spray & Walk Away Outdoor Cleaner | 1 Gallon
  • KILLS ORGANIC GROWTH ON YOUR OUTDOOR SURFACES WITH EASE: 30 SECONDS Spray & Walk Away kills lichen, moss and algae over time. Great for large, or hard to reach areas
  • EASY DIY HOME IMPROVEMENT: No pressure washing, rinsing, scrubbing, or hosing required. It takes 30 seconds to spray and then you simply walk away! Results will become visible over time. No need to hire a professional
  • WORKS ON A VARIETY OF OUTDOOR SURFACES: Works on many outdoor surfaces including roofs, composite shingles, sealed concrete, asphalt driveways and sealed brickwork. Its Bleach and phosphate-free, with a neutral pH
  • KEEP DRIVEWAYS, WALKWAYS AND PATHWAYS SLIP-FREE: Keeping your driveway and pathways free of organic growth improves traction, and will create a safer space around your home
SaleNo. 8
Crystal Plex - Lake and Pond Algaecide Treatment - Liquid Copper Algaecide Kills and Prevents Various Types of Algae (Planktonic, Filamentous, Chara) - 1 Gallon Treats up to 1 Acre
  • Controls many types of algae such as filamentous, chara, planktonic and swimmers itch for a beautiful and safe pond all year long
  • When used as directed, Crystal Plex is 100 percent safe for humans, fish, livestock, pets, birds, swimming and irrigation
  • Not for use in Koi, Goldfish, or Trout ponds
  • Treat only a third to half of your pond at a time
  • One gallon treats 1 surface acre 1-3 ft deep
No. 9
Wet & Forget Moss, Mold, Mildew, & Algae Stain Remover Multi-Surface Outdoor Cleaner Concentrate, Original, 64 Fluid Ounces
  • Concentrate outdoor cleaner removes stains caused by moss, mold, mildew, and algae with no scrubbing or rinsing, just wet it and forget it for hard, sealed non-porous surface including driveway, patio, roof, siding, deck, vinyl, wood, sealed concrete, canvas, aluminum, and upholstery
  • Dilute 1 part Outdoor to 5 parts water, apply with a garden sprayer generously to a dry, debris-free surface in mild climate, do not rinse or apply when rain is expected 4-5 hours after application; unused solution can be stored in sprayer for next use
  • Cleans over time with the wind and rain, green stains clean up within 1-2 weeks, black stains or heavy, stubborn stains can take several months, long-established stains may take 6-12 months; surfaces can stay clean up to 1 year or longer
  • It is bleach free and non-acidic; spray 100 feet away from lakes, ponds, rivers, and streams and flush plants with water before and after application
  • One bottle treats 375 - 1,125 square feet, heavy stained and porous surfaces will absorb more product
No. 10
Wet & Forget Outdoor Moss Mold Mildew & Algae Stain Remover 2X .75 Gallon
  • Concentrate outdoor cleaner removes stains caused by moss, mold, mildew, and algae with no scrubbing or rinsing, just wet it and forget it for surfaces including driveway, patio, roof, siding, deck, vinyl, wood, sealed concrete, canvas, aluminum, and upholstery
  • Dilute 1 part Wet & Forget Outdoor to 5 parts water and apply with a garden sprayer generously to a dry, debris-free surface in mild temperatures, do not rinse or apply when rain is expected within 4-5 hours of application; unused solution can be stored mixed and ready in sprayer for future applications
  • Cleans over time with the wind and rain, green stains clean up within 1-2 weeks, black stains or heavy, stubborn stains can take several months, long-established stains may take 6-12 months; surfaces can stay clean up to 1 year or longer
  • It is bleach free and non-acidic; spray 100 feet away from any water source and flush plants with water before and after application
  • Will treat approximately 1,100-3,400 square feet depending on surface, has an unlimited shelf life, and results last for a minimum of 1 year
No. 11
Bonide Captain Jack's Lawnweed Brew, 32 oz Ready-to-Use Spray, Fast-Acting Formula Controls Weeds, Moss, Algae, Lichens & Disease
80 Consomer Reviews
Bonide Captain Jack's Lawnweed Brew, 32 oz Ready-to-Use Spray, Fast-Acting Formula Controls Weeds, Moss, Algae, Lichens & Disease
  • CONTROLS WEEDS AND DISEASE - Use to control dandelion, moss, algae, lichens, chickweed, oxalis, clover, ground ivy and more. It also suppresses diseases such as dollar spot, rust, snow mold plus many more.
  • QUICK RESULTS - Injury to weeds can be noticed within hours of application. Treated weeds, moss or algae will turn brown or black.
  • FOR USE ON GRASS - Designed to kill a variety of weeds and diseases, not lawn grasses. When used as directed it kills a variety of weeds in lawns, roots and all.
  • DERIVED FROM IRON - Iron is an essential nutrient to the development and growth of plants.
  • READY TO USE - This product is conveniently ready to use when it arrives because it is not a concentrate that needs mixing. The nozzle makes this product easy to deploy.
SaleNo. 12
Sunday Weed Warrior, 32oz, 2 Pack - Grass & Weed Killer - Organic, Ready-to-Use Weed Killer Spray - Herbicide Spot Treatment - Kills Weeds, Grass, Algae and Moss
  • SUNDAY IS OFFICIALLY ON AMAZON: Sunday Lawn Care, the premium lawn care brand now available on Amazon! Say goodbye to harsh chemicals and hello to a healthier, greener lawn with Sunday.
  • FAST AND EASY: When it comes to stopping weeds, one warrior stands above the rest! Our organic weed and grass killer dehydrates weeds on the spot. Just point, shoot, and spray.
  • SAY GOODBYE TO PESKY WEEDS: Weed Warrior gets the job done without any harsh chemicals. A powerful herbicidal soap made from fatty acids, it eats away at most green leafy growth.
  • NOT FOR YOUR LAWN: It’s non-staining, but it’s also non-selective -- so don’t use it on your lawn. For use in flower beds, near patios, along sidewalks, in mulched areas, and more.
  • OMRI LISTED: Our convenient, ready-to-use weed killer is an OMRI-listed product so it’s approved for organic gardening. Once applied and fully dried, people and pets may safely re-enter treated areas.
SaleNo. 13
30 SECONDS Outdoor Cleaner 2 Pack with Hose End Sprayer - Cleans Stains from Algae, Mold and Mildew on Vinyl Siding, Deck, Patio, Brick and More
  • CLEANS STAINS CAUSED BY ORGANIC GROWTH: 30 SECONDS Outdoor Cleaner rapid cleans stains caused by algae, mold, mildew and moss
  • Safe For Lawn and Plants: When used as directed, 30 Seconds Outdoor Cleaner will not harm your lawn, trees, shrubs, or landscaping.
  • EASY TO USE: Just spray on to the surface you would like to clean and hose off! No more pressure washing
  • EFFECTIVE FOR MULTIPLE SURFACES: Works great on wood decks, concrete sidewalks, asphalt driveways, brick walls, most canvas awnings, plastic outdoor furniture, vinyl siding & more!
No. 14
30 SECONDS Spray & Walk Away Hose End Sprayer | 2 Pack | Roofs Composite Shingles Asphalt | 64 fl. oz.
  • KILLS ORGANIC GROWTH ON YOUR OUTDOOR SURFACES WITH EASE: 30 SECONDS Spray & Walk Away kills lichen, moss and algae over time. Great for large, or hard to reach areas
  • EASY DIY HOME IMPROVEMENT: No pressure washing, rinsing, or laborious scrubbing required. Simply attach your garden hose to the hose end bottle and spray! Results will become visible over time. Spray will reach second story of your home
  • WORKS ON A VARIETY OF OUTDOOR SURFACES: Works on many outdoor surfaces including roofs, composite shingles, sealed concrete, asphalt driveways and sealed brickwork. Its Bleach and phosphate-free, with a neutral pH
  • KEEP DRIVEWAYS, WALKWAYS AND PATHWAYS SLIP-FREE: Keeping your driveway and pathways free of organic growth improves traction, and will create a safer space around your home
  • PROUDLY MADE IN AMERICA: All 30 SECONDS products are manufactured in the USA with US and Imported Parts
No. 15
Bonide Captain Jack's Lawnweed Brew, 16 oz Concentrate, Fast-Acting Formula Controls Weeds, Moss, Algae, Lichens & Disease
  • CONTROLS WEEDS AND DISEASE - Use to control dandelion, moss, algae, lichens, chickweed, oxalis, clover, ground ivy and more. It also suppresses diseases such as dollar spot, rust, snow mold plus many more.
  • QUICK RESULTS - Cure your weed, moss, and disease* within hours of application. Treated weeds, moss or algae will turn brown or black.
  • FOR USE ON GRASS - Designed to kill a variety of weeds and diseases, not lawn grasses. When used as directed it kills a variety of weeds in lawns, roots and all.
  • DERIVED FROM IRON - Iron is an essential nutrient to the development and growth of plants.
  • EASY SPRAY APPLICATION - Product instantly mixes with water and should be applied with a backpack, compression, or knapsack sprayer. Carefully read and use according to label directions.
SaleNo. 16
API POND ALGAEFIX Algae Control 32-Ounce Bottle, FISHAQUARI (169G)
  • Contains one (1) API POND ALGAEFIX Algae Control Solution 32-Ounce Bottle
  • Effectively eliminates green water algae, string and hair algae, blanketweed algae and others
  • Controls green water to keep pond water clean and clear in ornamental ponds and water gardens
  • Use as directed to keep water safe for fish, pond plants, surrounding wildlife and pets
  • Dose every three days until algae is controlled and then treat weekly
SaleNo. 17
30 SECONDS Outdoor Mold & Mildew Stain Remover Spray | Ready To Use | 32 fl. oz. | 2 Pack
  • REMOVES STAINS FROM ORGANIC GROWTH ON YOUR OUTDOOR SURFACES: 30 SECONDS Outdoor cleaner rapidly cleans stains from algae, mold, mildew, dirt and grime
  • EASY DIY HOME IMPROVEMENT: No pressure washing or mixing required! Simply follow the instructions to use the motorized sprayer included and youre ready to make your home more beautiful
  • IMMEDIATE RESULTS ON A VARIETY OF OUTDOOR SURFACES: Works on many outdoor surfaces including decks, composite and stained surfaces. Concrete, bricks and masonry. Gutters, siding, canvas, plastic and stucco. Fences, arbors and painted surfaces. You can see results immediately!
  • PLANT AND LAWN SAFE: When used as directed, 30 SECONDS outdoor cleaner is safe to use around landscaping, plants, and your lawn. The formula breaks down once rinsed into the soil.
  • PROUDLY MADE IN AMERICA: All 30 SECONDS products are manufactured in the USA using US and imported parts

How to choose a good moss and algae killers

Does the idea of finding a fantastic moss and algae killers make you anxious? When it comes to purchasing this product, specifically when deciding which model to select, has your head been spinning between options? You are not alone if that is the case. We are aware of the pressure involved in the purchasing process!

Your presence here indicates that you are interested in moss and algae killers. Before choosing which product would be the best for your needs after being inundated with information, locate a reliable source with genuine selections. You can get that information from a variety of sources, including buying guides and rating websites, word-of-mouth recommendations from friends and family, online discussion forums where users can share their own experiences, product reviews that can be found all over the internet, and YouTube channels. You can only get the right product through exhaustive analysis. But you realize that’s not always simple. In order to ease your concerns, we have taken the time to develop a list of the top moss and algae killers products available right now. You might be wondering how we came up with the list. How was this buying guide developed?

First, we used our algorithms to gather as much reliable data as we could about these products. To verify all the data gathered, we used both artificial intelligence and a lot of algorithms.
Then, our experts used criteria that are recognized in the business to evaluate them according to their quality to price ratio, allowing us to choose the top moss and algae killers on the market right now!

The selection of the goods is not arbitrary. Before creating a list, we take into account a number of factors. Below are some of the criteria discussed:

Brand Value: What happens if you choose a dubious brand just because it appears to be a good deal? So the likelihood of receiving a product with a short shelf life increases. That is due to the fact that well-known brands have a reputation to uphold, while others do not. Top moss and algae killers brands strive to provide some distinctive traits that set them apart from the competition. So, hopefully one or more of the items on our list will be perfect for you.

Features: Useful features are all you need, not tons of them. We consider the important aspects and select the top moss and algae killers based on those.

Specifications: Numbers always help you measure the quality of a product in a quantitative way. We try to find products with higher specifications, but with the right balance.

Quality: A product’s quality may always be quantified with the aid of numbers. We look for goods with better standards that strike the proper balance. The best quality product that gets highly appreciated and recommended by experienced users.

Customer ratings:  Would it be accurate to suggest that the moss and algae killers were used by hundreds of customers before you? Superior ratings indicate that many customers had better service.

Customer Reviews: Like ratings,  provide you with accurate and reliable information about the product from genuine customers. Customer ratings are very important to all of us because they contain accurate and reliable information about the customer service we received from several hundred customers.

Seller Rank: This is very intriguing! Not only do you need a good moss and algae killers, you also need a product with rising sales that is trendy. It accomplishes two goals. First, the expanding user base proves the quality of the product. Second, given that number, producers must be able to offer greater quality and after-sales support.

Value: You get what you pay for, they say, so consider the value. Cheap isn’t always good and expensive isn’t always bad. However, that does not imply that spending a lot of money on a product that is flashy but underwhelming is a good idea. Before adding them to the list, we make an effort to evaluate how much value you can get for your money from your moss and algae killers.

Durability: Durability and reliability are closely related concepts. You will benefit from a strong and long-lasting moss and algae killers for months and years to come.

Product availability: Products come and go, and new ones replace the old ones. Most likely, a few new features and required changes were made. What use is it to use a supposedly good product if the maker no longer supports it? We make an effort to highlight products that are current and offered by one or more trustworthy sellers, if not more.

Negative Reviews: Yes, we do take that into account as well! The goods with the majority of bad reviews are filtered out and disregarded when we choose the best-rated one on the market.

These are the standards by which we selected our moss and algae killers. Do we end our process there? Hell no. The most crucial fact about us that you should be aware of is that we regularly update our website with current and pertinent information. We have one more layer of filtration since we place the greatest importance on reader satisfaction. Please let us know if any product included here is incorrect, irrelevant, subpar, or simply out of date. We always value your opinions, and we’ll work hard to make any necessary corrections to our list in response to them.

Why should you believe us?

There are now thousands of possibilities for these products on Amazon, but choosing the best one can be difficult and time-consuming. And what moss and algae killers should you purchase in 2022?

This guide is the result of more than 10 years of experience in researching, testing and writing about many topics. Each member of our team is an authority in their area. We read every article we could find online and every consumer review on every retail website for seven hours. Additionally, we discovered a ton of websites that offered helpful resources, including buying tips and thorough information on moss and algae killers.