I did a full water change on my 350 gal Freeflow spa about a month ago, and since then I've had lots of trouble getting the Ph to stay in the right range, all of the other levels (TA, FC, CC, CH, CYA) all seem to behave, but the Ph just seems to stay at 8.0 and above.
Here are the supplies I'm using:
- Pool Pal android app for calculating how much to put in
Taylor K2006 Test
Standard Bleach and Dichlor (for the first couple of weeks)
Calcium Chloride from the pool store
Something Called "Ph Down" which seems to be dry acid
Ph Minus from Spa Chem (haven't used this stuff but have a full bottle of it)
The Ph Down and Ph Minus products were left by the previous owner so I was hoping to use them up before buying Muratic acid.
I've been reading a lot of the info in Pool School, and in "How Do I use Chlorine" sticky post and I think I'm on the right path, but I'm not quite sure how I should proceed, so here is what I've done so far:
On Day 1:
- FC 4
I added 10 grams of the Ph Down (aka Dry Acid), and aerated for about an hour and then:
- FC 4
I added about 8g more of dry acid and aerated 30 min and the readings stayed the same, so I thought things had stabilized, but then the next day:
- FC 3
So my question is: Do I add more acid to bring the Ph Down again, because it seems like if I do that I'll drop my TA too low and that will be bad or make the Ph levels very unstable (which I guess they already are)
Thanks for helping a newbie out!