Clear Pond Sludge Buster Blocks, 8 1-Ounce Pack

I have a small koi garden pond, 500 gallons or so near the Cleveland, OH area. This past winter (12/13) I had enormous amounts of string algae form in the pond over the winter. I do have a UV filter on my canister filter that helps keep the algae under control, but I do not use that in the winter due to freezing. As the weather begins to warm and I prepare the pond for readiness I needed to find something (beneficial bacteria) to help me clear the sludge that was forming as I killed off the algae and also the other leaves and matter that had collected over the winter. I scooped out as much of the debris as possible, but there was still a lot of residual matter on the rocks, sides and bottom. I did not want to drain the pond. I purchased these blocks in hopes of helping me get the pond cleaner faster. After treating the pond with an algae treatment a few days earlier I added one block to the pond. Within a matter of days the matter began to be removed. I did have to clean my filter at least once a day sometimes two. The water now is crystal clear and I can see right down to the bottom of the 3 foot pond. The fish are happy and thriving, I leave them out all winter with the pump on low everyone is happy, me the fish, the other wildlife. Great product and worked for me with the combination of other things I was doing to clear the pond after winter.

I love it that you just toss these into your pond or in my case, pond and pondless waterfall,,, they do a super job of helping keep my water nice & clean!

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I was skeptical of this items promises. I've used many different products in an attempt to keep our ponds clear. With a healthy population of Koi this can be a challenge especially in the spring after a long winter.

I threw a couple of these "tablets" in when the pond was first uncovered and two more after a couple of weeks when the water had warmed. Mechanical filtering was not working well. Once this product kicked in it made an amazing difference. Our ponds have never cleared this early.

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Clear Pond Sludge Buster Blocks are easy to use and really break up the debris. I'm completely satisfied with their performance.

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Got the sludge out of the pond and in to our filter. We still ended up buying a UV Sterilizer to get clear water. We have an about 3000 gallon pond and it completely filled and clogged the 55 gallon rain barrel we converted into a filter. It was a big mess to clean out, but the sludge was out of the pond. We did two treatments over 4 weeks before the filter clogged, so keep in mind it's not fast acting, but it worked for us. Also, make sure you are keeping an eye on your filters, sludge clogs.