Hey TFP forum, this is my first post. Just finishing up my first full season of owning a pool. I'm very grateful for TFP Pool School, and all the great resources. Outside some hiccups opening the pool before I knew about TFP, I've had a fantastic season with completely clear water. I test daily for pH, FC, and the others periodically. My pH level seems to find equilibrium at 7.9-8.0, no matter what I do. During the 24hrs around chlorination, it will spike up to 8.1-8.2, but heads back down after that. Even when I use pH reducers (i.e. dry acid/sodium bisulfate) to try to lower it, it generally spikes back up slowly over 36 hours from dry acid addition. I was puzzled by this, so started testing borate levels. The prior pool owner used a pool combo product weekly, "Shimmer" (47.6% Cal Hypo, 20% Sodium tetraborate pentahydrate, 32.4% other, see:
Simple Salt Shimmer), and tested at pool stores. I suspect I might have higher borate levels, ~ 100pm, given Taylor test strips. The same test strips tested my non-pool tap water at 15pm, which should basically be 0ppm.
Questions:
1) Should I be concerned about my pH stability around 8.0?
2) Is my borate level of any concern?
3) Is it important to find a more accurate borate test?
* Per TFP articles...
a) "mannitol test for borates has been developed by some creative members. It is a bit complex and you can read about it
here."
b) "commercial
Borate Alkalinity Test Kit is available...."
4) I will drain about 25% of the pool water (i.e. 1 ft) when closing the pool at end of season. This should reduce borates by about 25%. Any reason to drain more than this?
Today's Tests:
FC: 4,
pH: 7.9,
TA: 90,
CH: 265,
CYA: 40,
TEMP: 81F,
Borates: 100ppm (rough approximate, as at end of Taylor test strip spectrum).
Water description: Clear
Sources/What I've Read:
PH - Further Reading
Borates in pool - Further Reading