I have a 2014 Sundance 880 Optima, ~400 gallons. It was not used in 2022, but was powered on and kept at temp. Last weekend I drained, cleaned and refilled it. When drained, there was a slight bit of plant debris in the bottom that had blown in through the side of the hinge in the cover, but very little. Drained completely and refilled with tap water (from a water utility, not well water). Since filling, the Ph has been persistently high according to both a Taylor test kit and brand new AquaChek test strips. Yesterday's readings were confirmed by my local pool store, so I'm confident both test chemicals and test strips are accurate. Note: test strips are only used to get the spa under control with most readings confirmed by Taylor tests. Chemicals used are a mix of brands. This is a new problem and has never happened before. The spa has not been used since being filled and the jests and air blower have only been run to mix in chemicals. Temp is 100. Spa is outside (NJ) but covered.
TC: 0.5
FC: 0.5
pH: 8.0+
TA: 70 (was 110)
CA: 9
Calcium Hardness: 140
Phosphates 2250 (no idea why)
I know the TC and FC are both low, but I was hoping to get the pH set first and then fix the chlorine. I typically use a pH stabilizer after I get the pH between 7.2 and 7.6 which I find makes it easier to get and keep the chlorine correct.
I used up some Robarb pH Down I had around and pH did not move. Clorox pH Down was the only brand I could get quickly and it has successfully blown the bottom out of TA (was 110 and after dosing yesterday is now 70) with no meaningful reduction in pH. It has shown some very short term reduction in pH (30 minutes after dosing) but after 2 hours or longer the pH is back up to or over 8. TA had fallen to 73 earlier in the week and I was able to raise it before trying to address the pH again, but adding the Clorox drops it back. Short of draining it and starting all over, does anyone have any thoughts? Thanks in advance.
TC: 0.5
FC: 0.5
pH: 8.0+
TA: 70 (was 110)
CA: 9
Calcium Hardness: 140
Phosphates 2250 (no idea why)
I know the TC and FC are both low, but I was hoping to get the pH set first and then fix the chlorine. I typically use a pH stabilizer after I get the pH between 7.2 and 7.6 which I find makes it easier to get and keep the chlorine correct.
I used up some Robarb pH Down I had around and pH did not move. Clorox pH Down was the only brand I could get quickly and it has successfully blown the bottom out of TA (was 110 and after dosing yesterday is now 70) with no meaningful reduction in pH. It has shown some very short term reduction in pH (30 minutes after dosing) but after 2 hours or longer the pH is back up to or over 8. TA had fallen to 73 earlier in the week and I was able to raise it before trying to address the pH again, but adding the Clorox drops it back. Short of draining it and starting all over, does anyone have any thoughts? Thanks in advance.
