Low PH

Problems relating to pH and total alkalinity.
Increase ph, increase TA. Reduce pH, reduce TA.
pH chemistry advice and techniques for the pool.
SlimJim

Low PH

Postby SlimJim » Tue 01 Aug, 2006 16:06

I have a problem I hope someone on this forum will be able to help me with.

First some info on my pool.

We've owned the pool for 11 years. It is an above ground 24' round and 6' deep in the middle. We bought the pool new. Had professionally installed and I've maintained ever since. I test the water with a good test kit but I don't use the test strips.

Now to my problem. At the beggining of the year the pool place said my total alkalinity was way high and had me put 2 gals. muratic acid in the pool to bring it down. Ever since I've battled low PH and low alkalinity. I've never had this problem in the past. After much reading on this forum, I proceeded to raise the alkalinity first by using Arm & Hammer Sodium Bicarbonate. After raising the alkalinity to 90 I proceeded to raise the PH using Borax. The 20 mule team green box Borax. So far I've added 12 pounds, not all at once of course, and the PH has only increased slightly. It's still reading about 6.9 to 7 on the teat kit. The alkalinity has increased to 130. At this rate I'm going to end up with a super high alkalinity rating again. Just like everyone else I'm having a hard time keeping clorine in the pool.

Any advice on what to do? I want to have this problem fixed before time to close the pool.

Thanks for you time and trouble. I know everyone has more important things to do than answer these forums.


SlimJim

Low PH

Postby SlimJim » Thu 03 Aug, 2006 10:56

I guess everyone is as stumped as I am. Thanks anyway.
pk4217
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Postby pk4217 » Thu 03 Aug, 2006 23:46

your CYA?
SlimJim

Low PH

Postby SlimJim » Sat 05 Aug, 2006 23:09

I forgot to mention CYA. It reads a little high I think. About 100. I took the water in to have it tested by someone I trust and was told to add 2 lbs of PH increaser. I've added 4 lbs and still reading the same. The only thing I can think of is 20 mule team borax is not the same thing as pool store PH increaser, soda ash I believe. I've added a total of 16 lbs borax and little change in the PH. The water is clear and it really sparkles though. Could it be that 20 mule team borax is more of an optimizer than an increaser? I guess my next step is to pay the price for pool store PH increaser and see what happens.

Thanks for asking.

I shocked the pool about 6:00 PM with 4 lbs. of shock. Thats about twice what I normally use to shock it. I just now tested 10:30 PM and the reading is about 1. I reshocked with 3 gal. liquid clorine and will recheck in the morning. I also shocked it with 3 gals. clorine last Thursday. I try to keep three 3" tri- clor tabs in the skimmer at all times. This is the first year I've used the 3" tabs. In years past I used biogard smart sticks. Like I said, I'm having a time keeping clorine in the pool.

I'll repost as I learn more. Keep those ideas coming boys and girls.
pk4217
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Posts: 25
Joined: Sat 08 Jul, 2006 00:19

Postby pk4217 » Sun 06 Aug, 2006 02:42

you using stabilized chlorine? change to liquid bleach, which will increase your PH but not TA.
SlimJim

Low PH

Postby SlimJim » Sun 06 Aug, 2006 09:29

Do you mean stop putting the 3" tabs in the skimmer and pour in liquid bleach as needed to keep the clorine level up in the pool? Or, use only liquid bleach to shock instead of calcium hypocloride? Or, maybe both?

Thanks again for the quick reply.
pk4217
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Joined: Sat 08 Jul, 2006 00:19

Postby pk4217 » Sun 06 Aug, 2006 12:38

stop using the 3" trichlor, it'll keep raising your CYA and lower you pH. unless you replace your water, or find a way to drop the CYA.

calcium hypocloride will lower your pH.
so, your only choice for the rest of the season is liquid bleach.
christian

Same problem

Postby christian » Sun 06 Aug, 2006 14:11

I am having this same problem, but have an in-ground pool. My pool is 12' X16', so how much liquid bleach do you think I should use?

This problem is killing me, as I may as well be dumping money into the pool rather than chemicals. Thanks.
pk4217
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Postby pk4217 » Sun 06 Aug, 2006 22:10

capacity for rectangular pool = length * width * average depth * 7.5 = total gallons.

assuming your average depth = 5', your pool = 12 * 16 * 5 * 7.5 = 7200 gallons.

1oz bleach of 12.5% will raise 1000gallons by ~1 ppm. and 2oz bleach of 6% will be needed for ~1ppm...... so, do the math.
SlimJim

Low PH

Postby SlimJim » Sun 06 Aug, 2006 22:12

Thanks PK4217. That's what I will do.

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