Cz Garden Supply K1 Moving Bed Biofilm Reactor for Aquaponics Aquaculture Hydroponics Ponds Aquariums (1 Gallon)

The product is good but the quantity is not what is described. I ordered 2 gallons. Which is 7.5 litres. I don’t think it was 7.5 litres. It was hardly 1 litre

I wanted to give zero star but was not an option, total useless it just floats and not at all solve tge purpose DO NOT BUY TO WASTE YOUR MONEY

Not 1 gallon. About 0.5 L. Price should have been 1/7th.

I have these in my home made moving bed filter for my koi pond. They take a few days fully colonize and to lose some of their buoyancy, (be patient, they will start to move around once the bacteria make a home of them) but when they do boy do these things move! In only a few weeks they have changed from a translucent white to a slight tint of yellow/tan, which means they are fully colonized with nitrifying bacteria (the good stuff) and they are working to remove harmful nutrients from your pond or aquarium. I highly recommend.

Love it. Completed packed two trays in my FX6 with it. I'm using it as a static media - doesn't clog and my water is immaculate. Staring lengthwise down my 6' tank is clear the whole way.

This stuff will make you forget filter mesh and ammo carb. You can use it in any variety of DIY bucket filters and with even moderate flow and aeration you can get crystal clear water with an excellent balance chemically. Plus it really will last forever. Just don't step on it - bites like an angry LEGO.

I owe CZ Garden Supply an apology. I returned them since they all floated and would not (initially) circulate in my home made air stone driven fluidized bed bio filter (formerly known as the 59 oz. Tropicana juice container with 1/8" holes drilled in the top, foam over the mouth, a hole to snap in a suction cup and an air line, and an airstone). I had purchased some K2 media before this, and the first K2 I bought circulated well right off the bat. This earlier experience made me think these media were defective. CZ refunded me right away and without question after I returned the product. After buying more K2, the second batch floated just like these ones had. I decided to let the media age in the running bio filter. After making 3 or 4 of the same filters (some with McCormicks 4.4 oz bac'n pieces containers), experience has shown that the media which floats very aggressively at first all begins to circulate within 7 days (most within 3 days) of filling the container and running the air stone. I figure the bacteria is starting to grow during these 7 days, and the circulation of the media only helps the filter once there is a reasonable amount of growth on the media anyway. These bio filters are very easy to make (check YouTube) and they look very cool circulating in the tank and making me hope they are helping the fish. Now that I see my mistake in returning this product once, I will give it another try. Sorry CZ and thanks for being cool about the first return.

The product is good.