still no plaster yet but I did go ahead and test the initial fill for the standalone hot tub. using the Taylor K-2005 that the PB provided.
pH would have read greater than 8.0 when I tried to match against the color scale. will likely re-test to make sure I was doing that correctly
FC between a 2 and a 3, though the TC appeared to read a solid 2 which doesn't make sense since FC should be less than TC?
CYA is less than 30 as the black dot never disappeared and I got to the top of the 9ml mark and couldn't keep adding drops.
I should note that we hadn't heated the water up yet when I grabbed the sample. It does appear that chemgeek's sticky assumes the temperature is around 100. is that going to impact my test results?
We'll be doing dichlor in the hot tub and SWG in the pool (almost ready for plaster) but wanted to get the spa fill squared away. Looking thru chemgeek's sticky on using chlorine for the hot tub it looks like we may be able to leave the CH where it is (although it appears 130-150 is ideal).
Looks like the first order of business is getting that TA lower (< 50 ppm)? So we're looking at adding enough acid (pool chemicals came with some MA so I suppose we'll break into that). So we'd add enough MA to get the pH down to 7.0, keep aerating and see if the pH raises again to >7.8, then add acid/test/repeat until pH settles in at 7.6 and stays there.
I guess I'll start with getting the pH to 7.6 and see what the TA is and go from there. Is it critical that I get the water temperature to around 100 before starting this?