Hello. I am wondering why the variance in ranges between the Pool Math app and the National Swimming Pool Foundation (NSPF)? I’m trying to understand the logic, not trying to sharpshoot. I’ve noted the differences below, and I’m interested in why TFP makes the different recommendation levels. I’ll put TFP values first. Thanks
FC: 3.0-7.0 ppm; 1.0-5.0 ppm (I think I understand why here. Because TFP utilizes CYA levels to determine a more accurate FC level.)
pH (Recommended/Ideal): 7.2-8.0/7.6-7.8;7.2-8.0/7.4-7.6 (With human eyes being in the range of 7.5, I would think that the NSPF ideal ranges would be a better range.)
TA (Recommended/Ideal): 50-90/60-80 ppm; 60-180/80-100 ppm (I would think the slightly higher values would provide a better buffer system)
CH(Recommended/Ideal): 0-650/50-550 ppm; 150-1000/200-400 ppm (I read that low and high calcium levels can have a negative impact to a pool. I am wondering if NSPF recommended is a better ideal range?)
CYA: 30-60/40-50 ppm; N/A/30-50 ppm (Only reason why I even put this in is that my pool is currently at 35 ppm. Should I raise raise to 40?)
FC: 3.0-7.0 ppm; 1.0-5.0 ppm (I think I understand why here. Because TFP utilizes CYA levels to determine a more accurate FC level.)
pH (Recommended/Ideal): 7.2-8.0/7.6-7.8;7.2-8.0/7.4-7.6 (With human eyes being in the range of 7.5, I would think that the NSPF ideal ranges would be a better range.)
TA (Recommended/Ideal): 50-90/60-80 ppm; 60-180/80-100 ppm (I would think the slightly higher values would provide a better buffer system)
CH(Recommended/Ideal): 0-650/50-550 ppm; 150-1000/200-400 ppm (I read that low and high calcium levels can have a negative impact to a pool. I am wondering if NSPF recommended is a better ideal range?)
CYA: 30-60/40-50 ppm; N/A/30-50 ppm (Only reason why I even put this in is that my pool is currently at 35 ppm. Should I raise raise to 40?)