Review on Enhance Water Filtration with hygger 6.2-Inch Large Aquarium Filter Media - 7.9 LBs 40-Pack by Jessica Baker

I added these blocks to my koi pond filter basket because I have had a lot of water clarity issues and algae in my pond. After 2 days the pond became clean. I have cleaned the blocks several times since purchasing them. They are easy to clean and reuse. I would highly recommend them to anyone looking to improve water clarity in their carp pond. I've also used a few in a well that also had algae in it and they also helped keep the well clean and clear.