SWG plaster pool needs to be kept at a pH of 7.4, due to iron; 7.5 does not work it starts to precipitate, our water is very soft, not sure if that is why. I like the CYA at 30, works for me, those two numbers I will not change. I understand that the numbers will fluctute somewhat but here are the two sets of targets as starting points only.
One other point, I do not know whether or not it will make any difference, the pool will now recieve a weekly maintenance dose of Jack's Magic "The Purple Stuff".
I realize FC of 4-6 is somewhat high but we have one the highest incidences of antibiotic resistant flesh eating bacteria in the US, mostly from water, so in our case better safe than sorry. The doctor I visited informed me, if caught early enough, certain antibiotics, targeted for the specific strain, can be use to treat the infection. Cultures have to be taken and grown, if the culture does not grow it is hard for the doctor to know what to perscribe. This can happen if you are already on an antibiotic as I am. Well it seems my foot infection is getting better but still not going way, lab results will be in tommorow.
Which of these two setups would be better, if the pH needs to stay at 7.4 and the CYA at 30, you are welcome to make other recommendations? I show both the "Pool Calculator" for the CSI, and the "poolequations" spreadsheet of 1/10/2010, which gives a slightly more negative figure, not sure why.
Current and Proposed
FC 4-6 Same
pH 7.4 Same
TA 110 70(60 is where the water normally settles naturally but I can up that a bit or up the CH over 600)
CH 350 600
CYA 30 Same
Salt 3300 Same
Borate 10 Same (might go up to 50 if I can find some cheap Boric Acid - not Borax as I do not like adjusting the pH)
Temp 84F Same (goes to 78F in winter)
CSI "Pool Calculator" -0.12 Same
CSI "poolequations" spreadsheet" -0.15 Same
Carbonate Alkalinity (ppm CaCO3) from "poolequations" spreadsheet" 98.8 58.8
Is CH 600 too high, would it be detrimental in any way, could it be moved higher? Is the CSI too negative? The pool will lose TA naturally, will add CH as necessary until in balance, whatever that CH may be, based on your recommendations.
Thank you to those of you that might reply.