I recently installed this 4000 gallon pond and about a week after it turned green I have about 50 koi. After trying every possible treatment it helped a bit but I still couldn't see my fish! After three days of using it, I can see a huge difference! Let's see how long this lasts. But so far I'm thrilled! I just added a video 7 days after my pond was crystal clear would definitely recommend this product
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