Nope no filters, should be straight forward, West Hippie has been using it in his ebb and flow with great results. Only difference from him is I'm going use liquid koolbloom with mine (I haven't opened the bottle and am broke, so no bud explosion or sweet candy this round).Oh wasn't thinking about hydro, but it says it's for all types, even hydro, and it mixes really well in about 10 minutes, it's dissolved only some small calcium flakes floating hmm, might want to strain it if you have filters, otherwise that may or may not cause a major clog, I'm not sure about that