Visiting the in-laws with the wife. They have an above ground vinyl pool. Its about 15,000 gallons (24 ft circular by 4.5 feet deep). I brought my test kit over and here's what I got:
PH: 6.6 or less? (Its very yellow, hard to tell exactly where its at other than its really low)
TA: Test turned red immediately.. could not test as it did not turn green.. related to PH?
CH: 100 (Ok for a vinyl pool I think?)
CYA: 90 (Yes, high.. they use pucks)
Water is clear and clean. But we need to get their PH into line. According to the pool calculator I think I should be adding AT LEAST 90oz by weight of baking soda (Same as washing soda?) to try to start to get things into line and then retest. As I said I don't know what the TA is and the PH is off the charts low.. but I don't want to over-adjust.