Hi! We're new pool owners and have been going by the recommended levels for various chemicals as outlined by the pool company for their printout. We have a fiberglass salt water pool- so I'm not sure if that makes a difference. I see the alkalinity suggested by TFP is 60-80, but the pool company suggests 80-120? TFP also recommends 350-550 for calcium hardness and they recommend 200-300? Finally, TFP recommends 70-80 for CYA/Stabilizer and they recommend 30-60? Are these differences because of the type of pool we have? Thanks in advance!