Have used this product for over six years. It was originally recommended to me by an employee at the aquarium store. My saltwater aquarium, which I regularly maintain (water changes, cleaning, etc.), is always crystal clear and I partly attribute that to this product. Every time we have guests (even repeat guests) we always get compliments on the cleanliness of the aquarium. From what I've read there may be cheaper alternatives, but it's easy to use - it's already boxed and ready to use. Remove from the container, rinse briefly under water and add to the aquarium. I have a Sea Clear acrylic aquarium with a "tray" on the back for this type of product. Try it!
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