My neighbor has a green bloom and I'm gonna take my TF100 down and hopefully show him the light :grin:, fortunately I've never had anything but crystal clear water since finding TFP..my question is how accurate or possible is testing CYA with greenish water? I can only assume it can be done but may be a little harder?? At least I know I can't figure out his shock level without at least knowing his CYA
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