---
product_id: 66837404
title: "CrystalClear Algae D-Solv Pond Algae Control, Fast-Acting EPA Registered Algaecide, Use in Fountains & Outdoor Ponds Containing Koi & Other Fish, Treats 5,760 Gallons, 16 Ounces"
brand: "crystalclear"
price: "€ 40.66"
currency: EUR
in_stock: true
reviews_count: 8
category: "Crystal Clear"
url: https://www.desertcart.nl/products/66837404-crystalclear-algae-d-solv-pond-algae-control-fast-acting-epa
store_origin: NL
region: Netherlands
---

# Fast-acting algae control Copper-free, plant-friendly Safe for koi & fish CrystalClear Algae D-Solv Pond Algae Control, Fast-Acting EPA Registered Algaecide, Use in Fountains & Outdoor Ponds Containing Koi & Other Fish, Treats 5,760 Gallons, 16 Ounces

**Brand:** crystalclear
**Price:** € 40.66
**Availability:** ✅ In Stock

## Summary

> 🌊 CrystalClear Algae D-Solv — Because your pond deserves a glow-up!

## Quick Answers

- **What is this?** CrystalClear Algae D-Solv Pond Algae Control, Fast-Acting EPA Registered Algaecide, Use in Fountains & Outdoor Ponds Containing Koi & Other Fish, Treats 5,760 Gallons, 16 Ounces by crystalclear
- **How much does it cost?** € 40.66 with free shipping
- **Is it available?** Yes, in stock and ready to ship
- **Where can I buy it?** [www.desertcart.nl](https://www.desertcart.nl/products/66837404-crystalclear-algae-d-solv-pond-algae-control-fast-acting-epa)

## Best For

- crystalclear enthusiasts

## Why This Product

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

## Key Features

- • **Versatile Use Cases:** Perfect for fountains, ponds, and water gardens without draining.
- • **Easy, Precise Dosing:** Treats up to 5,760 gallons with just 16 oz.
- • **Rapid Algae Eradication:** Clear your pond in days, not weeks.
- • **Fish & Plant Safe Formula:** Protect your koi and aquatic plants effortlessly.
- • **Broad-Spectrum Algae Control:** Tackles green water, string algae, and blanketweed.

## Overview

CrystalClear Algae D-Solv is a fast-acting, EPA-registered liquid algaecide designed to eliminate various types of algae including green water, string algae, and blanketweed. Safe for koi, ornamental fish, and aquatic plants due to its copper-free formula, it treats up to 5,760 gallons with easy application. Ideal for fountains, outdoor ponds, and water gardens, it restores crystal-clear water without the hassle of draining or scrubbing.

## Description

Buy CrystalClear Algae D-Solv Pond Algae Control, Fast-Acting EPA Registered Algaecide, Use in Fountains & Outdoor Ponds Containing Koi & Other Fish, Treats 5,760 Gallons, 16 Ounces: Water Treatment - desertcart.com ✓ FREE DELIVERY possible on eligible purchases

Review: It worked, it really worked! With one caveat. - This was recommended to me to The Pond Guy. We had some extensive work done on our pond this past spring, and the people who did the work also said they’d clean our pond… they used a pressure washer. A real no-no, as the spray is too harsh and washes off all the ‘good algae’. A plain garden hose would have sufficed and been far better. Anyway, flash forward 8 weeks and I had the worst string algae ever. So thick… I used a stick to pull up globs every morning, and that didn’t touch the issue. It just got out of hand. Our pond is small – only 500 gallons. I used 1-1/2 ounces - first I cleaned a bucket very well, then dipped it into my pond and collected a bit of pond water. Then I added the Algae D-Solv to the pond water, swished to mix, and gently poured it into our pond. I repeated this every 3 day, for a total of 3 times. After the 3rd day of the 3rd treatment (12 days later), there was NO string algae. None. Of course, throughout the treatment I did have to clean the pond, the filter, and skimmer daily. Also, I have 2 falls, and added 4 bubblers while I treated the pond, for added aeration, which helps. Unfortunately, it left my pond very turbid. I couldn’t see the fish, or anything. Tried water changes – several. Added beneficial bacteria (unnecessary). No help. Finally ordered CrystalClear RapiClear Liquid Flocculent – one treatment did the job. After that, I occasionally treat the string algae, once, which does the trick, and several days later add the flocculent. I have comets and shubunkins, and because I know my pond’s correct volume, they were never harmed, nor were my water lilies, hyacinths, or other pond and bog plants. I also had a couple comet fry, and they are fine. Not a fan of adding anything to my pond. I'm a big believer in letting nature do it's thing. But sometimes the pond needs a bit of human intervention to keep it healthy. UPDATE: The weather has cooled off here, and this product does not work as well in cool/cold weather, BUT it does work - you need to give it time. My string algae started to return so I did 3 treatments, adding the D Solv every 3 days. After the 3rd treatment I just gave the pond a few extra days and sure enough, it's totally clear of string algae once again (average nighttime temps are in the low 50's and I've stopped feeding the fish, of course).
Review: Algae killer - Works great

## Features

- Highly Effective Algaecide: Fast-acting, broad-spectrum algae remover effective in controlling many different types of algae including green water algae, string or hair algae, and blanketweed.
- No More Green Water: Perfect for controlling existing algae blooms and getting your pond back on track to being clean and clear. An easy-to-use alternative to draining and scrubbing your entire pond.
- Will Not Harm Koi & Ornamental Plants: Algae D-Solv contains no copper and will not harm fish or decorative plants when used as directed. Before using algae treatment, ensure pond has aeration.
- Easy Application: Apply 1 fl oz Algae D-Solv per 360 gallons of water. Once pond algae growth is under control, weekly doses will control algae growth and reduce pond maintenance.
- Variety of Applications: A great algae maintenance solution for fountains, self-contained aquariums, backyard ponds, lined water gardens, and decorative ponds without any outflow.

## Technical Specifications

| Specification | Value |
|---------------|-------|
| ASIN | B01N3UW3OR |
| Best Sellers Rank | #10,172 in Patio, Lawn & Garden ( See Top 100 in Patio, Lawn & Garden ) #16 in Water Garden & Pond Treatment |
| Brand | CrystalClear |
| Brand Name | CrystalClear |
| Customer Reviews | 4.1 out of 5 stars 3,999 Reviews |
| Included Components | CrystalClear Algae D-Solv - Registered Algaecide |
| Item Form | Liquid |
| Item Height | 8.5 inches |
| Item Weight | 16 Ounces |
| Liquid Volume | 16 Fluid Ounces |
| Manufacturer | Airmax |
| Target Species | Fish |
| UPC | 813166021228 |
| Unit Count | 16.0 Fluid Ounces |

## Product Details

- **Brand:** CrystalClear
- **Liquid Volume:** 16 Fluid Ounces
- **Item Weight:** 16 Ounces
- **Item Form:** Liquid
- **Manufacturer:** Airmax

## Images

![CrystalClear Algae D-Solv Pond Algae Control, Fast-Acting EPA Registered Algaecide, Use in Fountains & Outdoor Ponds Containing Koi & Other Fish, Treats 5,760 Gallons, 16 Ounces - Image 1](https://m.media-amazon.com/images/I/61OLGoXPwaL.jpg)

## Available Options

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

## Questions & Answers

**Q: My rocks are still covered in algae after two applications: any tips?**
A: When using CrystalClear Algae D-Solv, make sure to clean the excess algae off the sides, ornaments, and rocks before adding this product. This will reduce the amount of decaying organic matter.  Also, you will get the best results using this product in conjunction with vigorous aeration and then following up with beneficial bacteria.

**Q: Is this product safe to use on water features that attract birds?**
A: Sorry don’t know. Ask manufacturer

**Q: How much for a 300 hondred gallon pond**
A: Dilute 1 ounce of CrystalClear Algae D-Solv for every 360 gallons in a container of pond water. Pour the solution into the pond in an area with the greatest circulation. You will see the best results using Algae D-Solv in conjunction with vigorous aeration.

**Q: I just have a small fountain, how much should I use for 4 gallons?**
A: Guessing teaspoon.  A small portio you’d use in a koi pond. Read instruction. Use a small % of that. We have 2 koi ponds 4x16x2 feet and 4 ft wide and 2 feet deep x 22 feet long.

## Customer Reviews

### ⭐⭐⭐⭐⭐ It worked, it really worked! With one caveat.
*by C***. on September 26, 2023*

This was recommended to me to The Pond Guy. We had some extensive work done on our pond this past spring, and the people who did the work also said they’d clean our pond… they used a pressure washer. A real no-no, as the spray is too harsh and washes off all the ‘good algae’. A plain garden hose would have sufficed and been far better. Anyway, flash forward 8 weeks and I had the worst string algae ever. So thick… I used a stick to pull up globs every morning, and that didn’t touch the issue. It just got out of hand. Our pond is small – only 500 gallons. I used 1-1/2 ounces - first I cleaned a bucket very well, then dipped it into my pond and collected a bit of pond water. Then I added the Algae D-Solv to the pond water, swished to mix, and gently poured it into our pond. I repeated this every 3 day, for a total of 3 times. After the 3rd day of the 3rd treatment (12 days later), there was NO string algae. None. Of course, throughout the treatment I did have to clean the pond, the filter, and skimmer daily. Also, I have 2 falls, and added 4 bubblers while I treated the pond, for added aeration, which helps. Unfortunately, it left my pond very turbid. I couldn’t see the fish, or anything. Tried water changes – several. Added beneficial bacteria (unnecessary). No help. Finally ordered CrystalClear RapiClear Liquid Flocculent – one treatment did the job. After that, I occasionally treat the string algae, once, which does the trick, and several days later add the flocculent. I have comets and shubunkins, and because I know my pond’s correct volume, they were never harmed, nor were my water lilies, hyacinths, or other pond and bog plants. I also had a couple comet fry, and they are fine. Not a fan of adding anything to my pond. I'm a big believer in letting nature do it's thing. But sometimes the pond needs a bit of human intervention to keep it healthy. UPDATE: The weather has cooled off here, and this product does not work as well in cool/cold weather, BUT it does work - you need to give it time. My string algae started to return so I did 3 treatments, adding the D Solv every 3 days. After the 3rd treatment I just gave the pond a few extra days and sure enough, it's totally clear of string algae once again (average nighttime temps are in the low 50's and I've stopped feeding the fish, of course).

### ⭐⭐⭐⭐⭐ Algae killer
*by C***E on January 6, 2026*

Works great

### ⭐⭐⭐⭐ Good value.
*by A***R on December 28, 2025*

Easy to use... Not sure how effective it will be long term. Water is clear at this time.

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*Product available on Desertcart Netherlands*
*Store origin: NL*
*Last updated: 2026-01-31*