so it's light in color? It could still be trich though, even if it's not the right color, I would do the testing and see what comes up. Maybe take in a "mixed" poo sample from the box, a dab from each kitten. How long ago were they weaned? I missed their age I think? Is it patty-like, it holds it's form kind of in a puddle in the box, not real liquidy? Does it stick to the bottom of the box, like clay? I would add more fiber to their diet, which is the opposite of feeding the low-residue food. It may get worse before it gets better that way though. The concept behind the low residue food is that there's less to poo so it makes for less diarrhea. Where the idea of adding more fiber works by absorbing some of the liquid, and makes poo more solid (but it makes more poo). Evo is low residue too though, so you'd have to add a secondary fiber source. Pumpkin, or a fiber supplement for humans (just make sure there's no chemicals and it's JUST fiber, I'm not sure of "cat safe" OTC fiber drugs), or Feline Missing Link, that's high fiber too.
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