Kasco Pond Probiotics Time Release Block 2-Pack, 12 lb

Been using it for a few years and it really works! We have a 1/2 acre spring fed pond with 2 bottom aerators. We had been through many other muck pellets, powders and those could not keep up or make any sort of a dent in the muck. We use to have about 3 inches of muck from leaves and grass and this has taken care of it! I break it up into 3 or 4 chunks and toss it in around the pond. It takes a long while, say 3 to 4 months to be noticeable but it works. Keep adding it every few months to keep up with the build up of muck. I have trout in the pond so I can not use most of the algae chemical removers. This keeps the food for the algae down so we don't have those green string algae blooms . We add a dark dye in summer months to help.

Dropped the block into my channel July 1 and it appears to be working as bubbles are coming up in the area. By the end of the month, I will know if it is making a difference.

These seem to last a little longer than the other muck blocks I've purchased for cheaper. Results are slow but water clarity has improved, the water color even seems to be less muddy. (I have used multiple products) I haven't had any damaged ones arrive.

60 year old half acre pond ten foot at deepest over foot of muck . I put a gallon of pond dye in day before I added both the muck blocks. Next day my dye was gone and pond was a blue green color and noticeable clearer the day after that so I'm thinking it's working. I will buy again !!!

Our 1 acre pond has 2 double diffusers (aerators). We decided to add these bacteria blocks to help with muck reduction. Unfortunately the blocks never dissolved after 2 months sitting in the water close to diffusers. I complained to kasko customer service and they just sent new blocks. I installed replacement blocks, but they also didn’t dissolve after 2 months. I complained to kasko customer service again and got another set of blocks for replacement and they also didn’t dissolve. I went for 3rd circle with the same result :( at this point I’m confident this product is not designed to dissolve. I even directly asked kasko customer service to confirm this product is expected to dissolve in water, but kasko customer service refuse to confirm that just give me link to product booklet. I can bet that all 4 and 5 stars reviewers did not check if blocks dissolve. If block doesn’t dissolve how can it release bacteria to consume organic matter? Another discovery with Kasko customer service - this product packaging does not have manufacturing date or expiration date hence kasko customer service can’t event confirm you purchased product that is not expired. Kasko customer service blame Amazon for keeping their product in Amazon warehouse too long. However, when Kasko sends replacement from Kasko warehouse and can’t proof its fresh product - they just state that Kasko warehouse always has product with valid date. Just nobody can verify that. Stay away from this product - it just waste of time and money. UPDATE: 06/2025: I run experiment over winter months with this product by putting in the basement 2 plastic containers filled with RO water and tree leaves. Left container is control sample (no kasco bacteria) and right container is test sample (added kasco bacteria). After more than 6 months the results shows that control sample decomposed more comparing to test sample. This confirms that kasco bacteria does not help with organic matter decomposition and actually works as preservative and inhibits decomposition rate. You better off not adding this product to your pond water and let natural bacteria perform the work better on its own.

This block is supposed to be for much larger ponds than my 5800 gal. one, but I was having such a problem establishing a balanced ecosystem with crazy long string algae taking over, I bought it. That was about 3 weeks ago and I'm not sure it's made a difference. Currently, the algae has not increased, so maybe that's due to this marine bacteria block and the liquid bacteria I've added. As a standalone treatment, I don't think it would have much effect on the filamentous or planktonic (green water) algae. You need to combine forces with liquid bacteria. A few side notes: the bright, turquoise color of this block surprised me; it's not gray, like in the image. It was very visible on the bottom of my 4 ft-deep pond until it finally dissolved after about a week. Also, once I got it wet, it crumbled easily, so relocating/moving it is not a good idea.

I have treated my 100 x 300 ft. pond for over 20 years. The science of a pond changes with age. I've treated my pond with several muck removers including products from The Pond Guy, Lake Restoration, etc. I've used pellets & packets and algae control totaling over $2k annually. I stared using this muck block and placed a block @ each of my diffusers. (I also raised my diffusers by 12" by tying them to plastic milk crates for best aeration) I added and additional block in the center of my pond every 2 weeks acting like a shocker as you would a pool. MY POND LOOKS MAGNIFICENT.! In some areas of my pond I had muck/sludge up to 12+ inches. NOW IT'S GONE! With the loss of muck, the algae has diminished by 90%. I can't wait to see what my maintenance will look like next year. I used to hire teenagers to rake muck & algae 4x a year and never could get on top of the growth. In addition to the muck block, I occasionally needed to add some cutrine granular and occasional spray cutrine. Now it's about a cutrine application every 30 days (minor application) instead of a major investment weekly. I CAN'T RECOMMED THIS PRODUCT ENOUGH! Also, we have fish and a beach for swimming. SAFE FOR ALL.

I decided to try this product due to its size as it made more sense for my neglected pond, than throwing pellets as I had been doing. I wish I had a boat to drop them in better places because they are heavy to try to launch from the dock and the shore. It’s still too early to se results, but I expect it will be good.