After partial drain for high CYA: How's this look? and what next?

[Virtual]

As mentioned in an earlier posting, the pool that came with the just we just got had very high CYA. After a couple of partial drains, this is where we're at today:

FC = 5.2
CC = 0
Ph = 7.4
TA = 200
CH = 120
CYA = 80
Salt = 2900
temp = 76

I know the salt is a little low, but I wanted to ask whether I can stick with this CYA, or whether I should lower it further?

I also tested the FC at dusk tonight, so I can do an OCLT, but I don't know if it's too soon for that, since I just completed the latest adjustments this afternoon, to get the numbers listed above (which were taken about 1 hour after my last addition of adding Muriatic acid). My worry is that, although the water looks clear, I only get to tend to the pool on weekends so it took me 3 weeks to get the CYA down to 80 and the FC was in the 7-9 range by the time I would get back to the pool on the weekends (I'm still trying to dial-in the SWG), so it's possible there might be some algae in there?

I'll be able do some more adjustments tomorrow, but then won't be able to get back to it, till next weekend. So what, if anything, can I do now to maximize the chances that things will be o.k. when I get back here next Friday?

 

[cfherrman]

Raise it to half or full shock level. If you have problems or fail the oclt then it's probably best to drain 50% to get a more useful cya level to slam, but time being a issue it can be better for you to just slam at that cya, more initial cost for bleach.

You can drain 50% again to give you some room for tabs and floaters while your getting the swg setup.

 

[Virtual]

Here's the OCLT result.

Last night at dusk FC = 5.2, CC = 0, this morning at 5:30 am FC = 5.0, CC = 0

Am I good?

Should I still raise the chlorine before I leave just to be safe?

 

[cfherrman]

Yes, you also need to have your FC around 8 normally with your cya, check the FC/cya chart.

I would raise it just under shock level, wait 30 mins and brush the whole pool, then leave.

Consider a swg or clorine injection if you leave that place a lot, dumping clorine and leaving a week is not a good habit. You might be able to find a friend and have them pour a set amount every two days or something.