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These Supa Algae blocks are excellent at getting rid of Algae in your pond and maintaining it blanket weed Free so long as you use use the right amount to suit the size of your pond. Its good to add the first one late April, then another in early August, and that should do the year ok for ponds like mine , upto about 1000 litres. The blocks kill the blanket weed , this will help clog up your filter faster and need cleaning out until the mess has gone. The blocks are harmless to aquatic life & associated ecosytems and work by adding ureic nitrongen to the water which makes it difficult for the algae to survive.
Verified purchase: Yes | Condition: New
Only have a small pond that has a fountain and filtration box. Placed the "tablet" in the water. After over a week absolutely no change in the colour of the water. Still looks like pea soup.
Verified purchase: Yes | Condition: New
Tried various things to clear the water in the past even emptying and refilling with fresh water but always turned green and murky when sunny. I bought this product in May, initially it appeared to do nothing and my hopes sank, but you just need patience, my pond is now crystal clear and has been for the past month with no signs of algae. I've just ordered another to have in the shed in case the algae returns as not sure how long the block remains effective, but looking great at present. (Not seen my fish so clearly for years due to the murk I hadn't realised how big they had grown.) Best and easiest product I've tried.
Verified purchase: Yes | Condition: New
Used in a small pond that was suffering from green weed and cloudy water, the single circular block I put in sank to the bottom and worked wonders. Within an hour the weed had separated from the edges and I was easily able to scoop it out with a small net : the clarity of the water had also improved dramatically and I could see the block on the bottom. Highly recommended. Cheap to buy and immediately effective
Verified purchase: Yes | Condition: New
My small pond changed from pea soup to clear in a few days. The water isn't gin clear, more like tea - without milk obviously.
Verified purchase: Yes | Condition: New
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