Yes all good points, but chicken manure is used a lot by gardeners and I know plants love the stuff, as for insects well not all insects are harmful in fact some are an advantage but I never thought about clogging, perhaps there is a way I could simply extract the nutes from the manure, I suppose I just like to use natural stuff and every time I clean out the chickens I hate throwing away all that useful stuff, I reckon your right though maybe its not the best idea for a hydro set up.