Super High CH (875)

[SuperMiguel]

Water results from few mins ago:

FC -> 5.0
ph -> 7.2
TA -> 80
CH -> 875 (****)
CYA -> 50
SALT -> 3600


My CH seems very high what should i do lower it? Besides draining pool a bit and adding new water? is there another way?

 

[PoolStored]

Hey!

Replacing water, or reverse osmosis (expensive).

In here are instruction for doing a water exchange so you don't damage your pool by draining.

Draining - Further Reading

www.troublefreepool.com

 

[duraleigh]

Rain water should dilute it in Florida. How did it get so high? Calcium Hypochlorite?

 

[SuperMiguel]

Rain water should dilute it in Florida. How did it get so high? Calcium Hypochlorite?

Im not sure, its a new pool 2-3 months old. Calcium been raising constantly

 

[PoolStored]

Calcium been raising constantly

How are you testing your pool water?

 

[SuperMiguel]

How are you testing your pool water?

Tf-pro

 

[newdude]

As said above, FL gets 50+ inches of rain a year which is the bulk of a free water exchange. Some overflows right out without diluting your water, but you'll be looking to replace CH soon enough. Hang tight.

 

[Rancho Cost-a-Lotta]

Make sure you're using the correct multiplier for the sample size. 875 seems very high for a new FL pool unless you've been using calcium-based chlorine.

10 mL sample: Multiply drops by 25.

25 mL sample: Multiply drops by 10.

 

[JamesW]

I'm not sure, its a new pool 2-3 months old. Calcium been raising constantly

Can you show the test results and what has been added?

 

[SuperMiguel]

Can you show the test results and what has been added?

Mostly Acid and Salt... I just tested it again today and the number is rising almost 1000. What Can cause this?

Pool company did a wet (as in no drain, just added a bunch of acid) acid wash few weeks ago, but not sure if extra acid would increase CH

 

[SuperMiguel]

Make sure you're using the correct multiplier for the sample size. 875 seems very high for a new FL pool unless you've been using calcium-based chlorine.

10 mL sample: Multiply drops by 25.

25 mL sample: Multiply drops by 10.

I checked it today again and did 10ml 38 drops to turn blue and multiply by 25

 

[JamesW]

Sometimes plaster dissolves and the pH, TA and CH all go up continuously.

I would also recommend a K-1766 salt test kit and a salinity meter that measures salinity using conductivity.

Monitor the levels for a while and keep good notes so that we can see some history to see if there is an obvious pattern.

EC60 Premium Portable Pocket Conductivity/TDS/Salinity Meter/Tester Kit-Apera Instruments

The Apera Instruments EC60 Portable Pocket EC/TDS/Salinity Meter/Tester simply tests all kinds of regular conductivity measurements in an ACCURATE, QUICK, and RELIABLE manner.

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PC60 Premium Multiparameter (pH/EC/TDS/Salinity/Temperature) Pocket Tester/Meter Kit-Apera Instruments

The Apera Instruments PC60 Multi-parameter Tester/Meter simply tests pH/EC/TDS/Salinity/Temperature for regular aqueous solutions such as hydroponics, aquaculture, pools& spas, tap/drinking water, water treatment, cooling towers, etc.

aperainst.com

 

[JamesW]

Rapid pH increase with SWCG

Guys, I'm losing my mind with this pool. I've scoured all the threads on this topic here and in other forums. I've tried every "remedy" I could find, and yet, here I am, dumping gallons of acid in at a time only to come back a few days later to pH > 8.0. I've always felt I was very diligent with...

www.troublefreepool.com

 

[JamesW]

Pool company did a wet (as in no drain, just added a bunch of acid) acid wash few weeks ago, but not sure if extra acid would increase CH

A no drain acid wash (aka zero alkalinity treatment) will increase the CH by dissolving plaster, which contains calcium compounds like calcium hydroxide and calcium carbonate.

How much acid was added?

What was added to neutralize the acid and how much was added?

Why was the no-drain acid wash done?

 

[SuperMiguel]

A no drain acid wash (aka zero alkalinity treatment) will increase the CH by dissolving plaster, which contains calcium compounds like calcium hydroxide and calcium carbonate.

How much acid was added?

What was added to neutralize the acid and how much was added?

Why was the no-drain acid wash done?

Pool had some spotting whitish and pool company recommended adding acid, they added about 5-6 gallons of acid, it did remove the whitish on the finish (for few weeks, its coming back in some areas) they didnt add anything to increase the pH because when they tested it the pH had bounced already on its on. pH on this pool been crazy high since day one, i lower it with acid and its bounces back quick!

 

[JamesW]

The no drain acid wash increased the CH by about 300 ppm.

In my opinion, the plaster is probably defective and dissolving at an accelerated rate causing the pH, TA and CH to increase.

The other thread that I referenced had the same issue.

 

[SuperMiguel]

The no drain acid wash increased the CH by about 300 ppm.

In my opinion, the plaster is probably defective and dissolving at an accelerated rate causing the pH, TA and CH to increase.

The other thread that I referenced had the same issue.

Is there a way to test for this? Also i have an robot vacuum and since the acid wash its full of "sand" but the sand has like pool plaster particles. Also while brushing the pool i can see alot of this sand around.

 

[JamesW]

Is there a way to test for this?

Try scratching the plaster to see if it is hard or soft.

Weak plaster scratches easily and good plaster is hard to scratch.

In weak pebble plaster, the pebbles come loose easily when brushing or scratching.

Are you getting a lot of loose pebbles?

This is difficult to tell the difference if you do not have a reference for good and bad plaster.

If the pH, TA and CH are all increasing continuously without adding fill water or chemicals, then the plaster is dissolving.

If the TA and CH increase the exact same amount, the plaster is probably dissolving.

Did you register the plaster with NPT?

Contact NPT and see what they have to say.

They can get a sample of the plaster by doing a core drill down to gunite and then examining the plaster for quality assurance.

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www.nptpool.com

 

[SuperMiguel]

Try scratching the plaster to see if it is hard or soft.

Weak plaster scratches easily and good plaster is hard to scratch.

In weak pebble plaster, the pebbles come loose easily when brushing or scratching.

Are you getting a lot of loose pebbles?

This is difficult to tell the difference if you do not have a reference for good and bad plaster.

If the pH, TA and CH are all increasing continuously without adding fill water or chemicals, then the plaster is dissolving.

If the TA and CH increase the exact same amount, the plaster is probably dissolving.

Did you register the plaster with NPT?

Contact NPT and see what they have to say.

They can get a sample of the plaster by doing a core drill down to gunite and then examining the plaster for quality assurance.

NPTpool Contact Us, NPTPool Toll Free Number | NPTpool.com

NPTpool Contact Us, Toll free number will help you to, Get help for all pool tile & pool finishes, Hardscapes & outdoor living tiles. Visit NPTpool.com

www.nptpool.com

NPT Pool Finish Warranty Information | NPTpool.com | NPTpool.com

www.nptpool.com

I didnt know i had to register plaster with NPT, i guess i can call my pool company and see what they say

 

[JamesW]

I didn't know I had to register plaster with NPT, I guess I can call my pool company and see what they say

Here is what I predict they will say:

"It's fine, just keep an eye on it. There's nothing to worry about. Don't listen to people on the internet. We're the experts, trust us".