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I just added the K3 chips in my filter system(2 weeks ago) at a 20% bio-chips 80% k1 ratio. Bio-chips are designed primarily to be bacterial media to process nitrogen based chemical waste. K3 was designed to "house" a diffent set of critters than K1. It is designed to create tiny little quiet cells to permit population by tiny critters that would not be able to populate a highly aererated high flow filter system or koi pond. THe tiny size of these cells creates a quiet zone protected by surface tension vs the outside churning and high velosity zone. Tiny flat worms, rotifers, hydra's and other critters consume the larger bits of organic material than bacteria can process. Sales claim is to be able to reduce docs and increase water clarity by adding to the same moving bed as K1 vs K1 alone.
Attached a photo of the biochip before adding to filter. 2nd photo is not very clear but taken thru my microscope eyepiece at 40X with my digital camera. After only two weeks(in mature system) already well colonized with all kinds of critters. 3rd file is mpeg of brief video that you can hopefully see the tiny critters better swimming around inside of a cell in the biochip
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