Re: Chlorinator percentage mystery: 5% change drops FC rapid
My water is almost crystal clear all year long. I say almost because at night with lights there are plainly visible specks in the water which I attibute to calcium. I sweep the pool sides once a week, vacuum the bottom twice a week, use the leaf bagger three times a week, and clean the skimmer baskets daily. I have never seen an algae bloom. The most suspicious I have become is a yellowish dusting on the sides and steps that floats off easily when I sweep so I tend to think it is pollen or dust (we have several, big pine trees in the back yard).
Here are my numbers, which haven't fluctuated much at all for the summer months, and "how I got them"; not sure that matters much as I get repeatable results.
80F < H2O temp < 90F
Sand filter
FC ~ 6 (DPD)
TC ~ 6 (OTO)
CC ~ 0 (simple math)
pH ~ 7.5 (red drops, Taylor or HTH) (managed every second day with muriatic acid)
CH > 600 (green drops, HTH, no magnetic stirrer)
TA ~ 60 (blue drops, HTH)
CYA ~ 70 (disappearing black dot test, Taylor)
MajorDIY:
We are on opposite corners of the continent but it is interesting how we have similar observations. Would you mind trying to drop your percentage to 45 and see what happens? I have dropped mine below 50 about three times this year and I get the same results (not good) each time. I have not done focused testing on percentages above 50 to see if FC gets really high as I crank up the cell time. I guess I can be happy at 50 and just add cheap bleach before parties rather than stressing the T-15.