i hv used this b4, no noticeable results. instructions on how to use it is written on the packaging, basically is to put the appropriate amt into a filter mesh bag and put in ur sump. phosguard does claim that it does not affect other parameters.
what kind of fault??? i oso dunno, i m in jepun........ heard that the compressor juz broke down for no reason........ my next setup, i m going for 2 1/2hp chillers (run both)........
i reckon u get a good chiller, dun be like me..... tank crashed due to faulty chiller and i hv lost abt 90% of my sps worth at least 3k. There r reliable brands like teco, pacific coo, daeil, etc juz to name a few.