Apologies for the post as it seems this question has been asked by a dozen others, but I haven't seen other posts yet with numbers quite like my manufacturer is recommending.
Recently (past spring) added SWG. Looking to add borates (and understand it won't help me use less acid), but in researching that, it brought my attention to the rather wide chemical recommendation differences between TFP and SGS (SWG manu).
FC: 3-5 or 4-6 (depending on where you look, & CYA)
pH: 7.6-7.8 (or 7.5-7.8, depending on where you look)
Being in the Phoenix area, my CH is hovering around 900 currently, and not a whole lot I can do about that right now. SGS' manual does state, "The harder the water, the lower TA should be kept."
Can someone help me understand why such a disparity, and if I truly should scrap the manu and go with TFP recommendations? If it makes any difference, my SWG is oversized (based on pool volume) and runs at 50% during peak summer months and I had it at 25% prior to that, successfully maintaining ~2.0-3.0 FC.