---
product_id: 3227218
title: "SeaKlear 90-Day Algae Prevention & Remover, 1 Qt"
brand: "seaklear"
price: "€ 70.85"
currency: EUR
in_stock: true
reviews_count: 6
category: "Sea Klear"
url: https://www.desertcart.at/products/3227218-seaklear-90-day-algae-prevention-and-remover-1-qt
store_origin: AT
region: Austria
---

# 90-day algae prevention Non-staining & non-foaming formula 11.8% Copper Sulfate Pentahydrate SeaKlear 90-Day Algae Prevention & Remover, 1 Qt

**Brand:** seaklear
**Price:** € 70.85
**Availability:** ✅ In Stock

## Summary

> 💦 Crystal-clear pools, zero algae drama — all season long!

## Quick Answers

- **What is this?** SeaKlear 90-Day Algae Prevention & Remover, 1 Qt by seaklear
- **How much does it cost?** € 70.85 with free shipping
- **Is it available?** Yes, in stock and ready to ship
- **Where can I buy it?** [www.desertcart.at](https://www.desertcart.at/products/3227218-seaklear-90-day-algae-prevention-and-remover-1-qt)

## Best For

- seaklear enthusiasts

## Why This Product

- Trusted seaklear brand quality
- Free international shipping included
- Worldwide delivery with tracking
- 15-day hassle-free returns

## Key Features

- • **Easy, no-fuss application:** Just 16 fl oz per 10,000 gallons for prevention; doubles for severe algae outbreaks.
- • **Long-lasting algae defense:** Keeps your pool crystal clear for a full 3 months with one treatment.
- • **Powerful multi-algae killer:** Effectively eliminates blue-green, black, yellow, and green algae resistant to chlorine.
- • **Gentle on your pool surfaces:** Non-staining and non-foaming formula protects your pool’s finish and water clarity.
- • **Trusted by pros & pool owners alike:** Certified Pool Operators and thousands of users swear by its reliable performance.

## Overview

SeaKlear 90-Day Algae Prevention & Remover is a professional-grade liquid treatment featuring 11.8% Copper Sulfate Pentahydrate that kills and prevents multiple algae types for up to 90 days. Its non-staining, non-foaming formula ensures pool surfaces stay pristine while delivering easy, effective algae control with minimal maintenance.

## Description

SeaKlear 90-Day Algae Prevention & Remover, 1 Gallon Bottle. kills & prevents blue-green, green, yellow & black algae.

Review: Algae Treatment - Fantastic product that works well. I have been using it in my pool for years and it has never let me down.
Review: Knocked out our Mustard Algae like a Champ! - I am the Certified Pool Operator for my neighborhood pool and we have been battling mustard algae for the past two years. Last summer we did some crazy shock treatment with some other chemicals recommended by Leslies Pool Supplies that took 2 or three days and way too much work. The algae was back after awhile anyway. For those who do not know, mustard (yellow) algae is chlorine resistant so shocking the pool, much less regular chlorine levels, does not help much. Determined to find a chemical solution, I came across this product online. After mulling it over for a couple of weeks I decided to give it a try. Our pool holds 138,000 gallons and I decided to use 10 quarts of this stuff. The price here on desertcart was the best around and I got it via Prime in a couple of days. I like the fact that the pool just has to be reasonably balanced to put the chemical in. I shocked the pool to 12 ppm of Chlorine over night and put the SeaKlear in the next evening. I mixed each quart in a 5 gallon bucket with pool water and poured it around the pool, mainly the deep end. Only had the pool shut down for one day and that was mainly for the shock treatment. Well the first couple of days, I still saw some algae on the floor and was concerned it didn't work. It was not all brushed up beforehand. Well after it was brushed, I have not seen it in two weeks. The pool water is crystal clear, as well as the walls and floors and no mustard algae to be seen. Even disappeared from the drains on the bottom. Very impressed. Hopefully it will last the 90 days or more or at least until the pool is closed, which will be another 45 days or so. The pool attendants are very happy as well. I had them brush the pool constantly to try to keep this terror at bay. Only one little issue and I considered taking a star away for it but I am so giddy about that pesky mustard algae being gone I couldn't do it. The copper can stain, which is the main reason I premixed it. Well, it did not stain our pool at all afterwards using the technique described above. Little platinum blonde girls hair is another matter. Poor girl got out of the pool with hair almost as green as grass. LOL Fortunately her mother was able to get it out and is aware of the issue and puts special conditioner and protection on her hair to help prevent it happening or being as severe. Some ladies with colored/highlighted hair may have some issues as well but I have not had anyone else complain. Overall I am very pleased with the product. Will give an update after the season is over. Right now, I will plan to use this again if that nasty mustard algae props up its ugly head again next year.

## Features

- Reliable & Effective
- 90-days no algae guarantee (when used according to instructions in balanced pool water)
- Kills and prevents blue-green, green, yellow and black algae
- Non-foaming, non-staining (when used according to instructions in balanced pool water)
- 11.8% Copper Sulfate Pentahydrate; 3% Copper as elemental
- Effective against blue-green, black and mustard algae
- Nonstaining formula
- Each treatment will last three months
- Use 16 fluid ounce 10000-gallon of pool water to prevent algae growth in all pool types
- For severe algae treatment use 32 fluid ounce per 10000-gallon of pool water

## Technical Specifications

| Specification | Value |
|---------------|-------|
| ASIN | B0049VQ89S |
| Best Sellers Rank | #7,547 in Patio, Lawn & Garden ( See Top 100 in Patio, Lawn & Garden ) #16 in Swimming Pool Algaecides |
| Brand Name | SeaKlear |
| Customer Reviews | 4.4 4.4 out of 5 stars (4,048) |
| Item Form | Liquid |
| Item Type Name | 90411SKR |
| Item Weight | 2.4 Pounds |
| Manufacturer | SeaKlear |
| Product Benefits | Controls Algae |
| UPC | 662817904119 |
| Unit Count | 1.0 Count |

## Product Details

- **Brand:** SeaKlear
- **Item Form:** Liquid
- **Item Weight:** 2.4 Pounds
- **Product Benefits:** Controls Algae
- **UPC:** 662817904119

## Images

![SeaKlear 90-Day Algae Prevention & Remover, 1 Qt - Image 1](https://m.media-amazon.com/images/I/71w016hEQtL.jpg)

## Available Options

This product comes in different **Style** options.

## Customer Reviews

### ⭐⭐⭐⭐⭐ Algae Treatment
*by P***R on March 7, 2026*

Fantastic product that works well. I have been using it in my pool for years and it has never let me down.

### ⭐⭐⭐⭐⭐ Knocked out our Mustard Algae like a Champ!
*by C***Y on July 31, 2016*

I am the Certified Pool Operator for my neighborhood pool and we have been battling mustard algae for the past two years. Last summer we did some crazy shock treatment with some other chemicals recommended by Leslies Pool Supplies that took 2 or three days and way too much work. The algae was back after awhile anyway. For those who do not know, mustard (yellow) algae is chlorine resistant so shocking the pool, much less regular chlorine levels, does not help much. Determined to find a chemical solution, I came across this product online. After mulling it over for a couple of weeks I decided to give it a try. Our pool holds 138,000 gallons and I decided to use 10 quarts of this stuff. The price here on Amazon was the best around and I got it via Prime in a couple of days. I like the fact that the pool just has to be reasonably balanced to put the chemical in. I shocked the pool to 12 ppm of Chlorine over night and put the SeaKlear in the next evening. I mixed each quart in a 5 gallon bucket with pool water and poured it around the pool, mainly the deep end. Only had the pool shut down for one day and that was mainly for the shock treatment. Well the first couple of days, I still saw some algae on the floor and was concerned it didn't work. It was not all brushed up beforehand. Well after it was brushed, I have not seen it in two weeks. The pool water is crystal clear, as well as the walls and floors and no mustard algae to be seen. Even disappeared from the drains on the bottom. Very impressed. Hopefully it will last the 90 days or more or at least until the pool is closed, which will be another 45 days or so. The pool attendants are very happy as well. I had them brush the pool constantly to try to keep this terror at bay. Only one little issue and I considered taking a star away for it but I am so giddy about that pesky mustard algae being gone I couldn't do it. The copper can stain, which is the main reason I premixed it. Well, it did not stain our pool at all afterwards using the technique described above. Little platinum blonde girls hair is another matter. Poor girl got out of the pool with hair almost as green as grass. LOL Fortunately her mother was able to get it out and is aware of the issue and puts special conditioner and protection on her hair to help prevent it happening or being as severe. Some ladies with colored/highlighted hair may have some issues as well but I have not had anyone else complain. Overall I am very pleased with the product. Will give an update after the season is over. Right now, I will plan to use this again if that nasty mustard algae props up its ugly head again next year.

### ⭐⭐⭐⭐⭐ My favorite algaecide
*by S***T on June 12, 2025*

This is my favorite algaecide, and it is the best product I have found to keep my pool free from algae of all colors. I had a problem with yellow algae a couple of seasons--tried numerous expensive products to get rid of it that did not work. This product solved the issue and made me a regular customer. It is economical and works for 90 days.,

## Frequently Bought Together

- SeaKlear 90-Day Algae Prevention & Remover, 1 Qt
- Clorox® Pool&Spa™ Swimming Pool Algaecide and Clarifier, Prevents and Treats Pool Algae, Clears Water, 128 Fl Oz (Pack of 1)
- HTH 52037R Pool Care Shock Advanced, Swimming Pool Chemical - Cal Hypo Formula, Prevents Bacteria & Algae, Restores Crystal Clear Water - Shock Treatment, 1lb (12 Pack)

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*Product available on Desertcart Austria*
*Store origin: AT*
*Last updated: 2026-04-22*