Hi there! I recently revived my 425 AG Sierra 6000 spa and have been going nuts keeping the PH level down... here's my current test as of 20 minutes ago:
FC - 4
CC - 0
pH - 8.0 (just added 1 oz of sodium bisulfate - 2 drops on acid demand test)
TA - 70
CH - 170
CYA - less than 30 - filled up the comparator and could still see the black dot.
Borates - added Gentle Spa per its instructions. Unknown how much is in there and I don't have a test for it.
The water is clear and smells just fine. I arrived at those numbers based on the recommended pool calculator values. I've been noticing since I filled the spa that the PH drifts to 8 and stays there. It is always a 2-drop acid demand per the Taylor K-2006. I'm constantly having to add "PH Down" to come down to 7.4-7.6 levels.
I have a Nature2 mineral filter that is not installed and the filters (microfiber sock-style) are brand new and clean. I've been trying to find a cartridge conversion for that, by the way... but the holes are not threaded. Unicel told me I'm SOL.
The spa is always covered and only exposed to the elements when we are in it.
Anything stand out?
Thanks in advance!