I have been using k1 for 2 years now you need to put it in a bag or it gets everyeere in the sump
It also need to move to self clean
My sump is run full so no wet and dry its set up like a giant canister filter
It also floats so I just have 3 big air stones in my sump to move it all around and air the media more
My dump has eheim efimech on the bottom then eheim substrate pro then the k1 floating on the top this is all in the big main part of the sump
The 1st part of my sump were the water comes in has jap mat which is like the course pad in a canister filter
I can't stand filter socks
The next part of the sump has bio balls
The 1st and 2nd parts of the sump are both 30 long x 10 wide
I stir all the main part of the sump up once per month and turn the drip up full over night so about a 50% water change
The tank goes like soap and would scare most people but it's dupe clear the next morning I then wash the jap mats the next day just like you would a pre filter
Been running it like this and had no problems
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