High Ph a problem?

[Condo Steve]

Hi,
Just took over pool duties in a 15,000 gal. inground plaster pool at my home. My Ph is pegged high on my phenol test. What problems are associated with too high Ph? I am adding 30 percent muriatic each night, about 8 oz. that I dilute with a bucket of pool water before pouring into the pool. Three nights and it hasn't moved from pink. Pool is open year round in S. Florida. Water looks clear. Waiting for Ben's kit to test CYA levels and extablish a proper maintenance level of Cl. Right now I pour in about a quart of 6% bleach each night and the OTO reads about 1.0 to 1.5 after an hour or pump running.
Thanks,
Condo Steve

[Watermom]

What ph reading are you getting?

[Condo Steve]

I don't have the kit in front of me, but I believe that the indicator tops out at 8.2 (pink). I would like to get out of the maximum indicated range and back near the middle. Pink could be 8.2 or anything higher.
I know that low Ph is problematic, but is a significantly higher Ph a problem causer?
Thanks,

Condo Steve

[Watermom]

Scaling is often a problem with high ph. Keep working to get it down. Aim for 7.4-7.6.

[mphare]

I don't believe 8 oz is enough muriatic to get much of a difference in a 15K pool.
I have a 13.5K and I usually add 2 to 3 cups of muriatic acid to get a few tenths of pH difference.

[Watermom]

Do a search for any post made by mwsmith2 who is one of the members of the forum. In his signature is a link for a bleach calculator that you can download. Once you do, if you will click in the upper left corner "more calcs" you will find a calc that can help you determine how much muriatic acid to add for a desired ph change per volume.