I think i have something in my lines that is eating FC. I have cleaned the light niche, step screw cover panels, ladder, and still having difficulty maintaining FC. CC is around 0.5. When i was using Baquacil I cleaned them using LineClean as mentioned in this old thread: Baquacil Cloudy Pool/White Water Mold - SOLVED. But i'm not sure if that product is compatible with chlorine/cya. I think the LC product is similar to MSP. Does anyone know if i can add use MSP safely without any negative effects? [edit-or what is the safest max concentration i can pour into the skimmer?] Or have a better suggestion? Thanks