A pool service tech is telling me the stains on my 12 year old pool plaster is scaling and an acid wash using muriatic acid would help! Is there step by step instructions on here somewhere? I just want to double check what he’s telling me is correct! He said put 7 gallons of muriatic acid to my (11,000 gal) pool and a bottle of metal out. Keep the filter running on high 24/7 for 5 days. And brush the plaster at least twice daily. Then balance the chemicals back afterward. Does that sound right?
No drain acid wash
- Thread starter Maddie
- Start date
- May 23, 2015
- 24,379
- Pool Size
- 16000
- Surface
- Plaster
- Chlorine
- Salt Water Generator
- SWG Type
- Pentair Intellichlor IC-60
That is not right. 1 gallon of acid on your pool will lower the TA by 46ppm. 7 gallons would send the TA negative (consumes 319ppm of alkalinity), would crash your pH to below 2 and very likely damage your plaster. That much acid would make your plaster rough and porous which will only lead to more staining and a weaker surface. You will also damage your SWG with that low of a pH not to mention any metal components in your pool.
Do NOT follow that advice. You will wreck your pool.
Do NOT follow that advice. You will wreck your pool.
Oh wow, thanks! I just read this thread…The Zero Alkalinity Acid Treatment
It seems that I would use 2 gallons of MA then?
It seems that I would use 2 gallons of MA then?
Last edited:
ferretbone
In The Industry
Yeah 7 gal is kinda crazy for 11,000. Turn your equiptment off. Use two bottles and brush with a wire brush for three or four days. Bring the ALK and Ph back up and start your pump.
ferretbone
In The Industry
Na! leave it off for a few days, just brush her down the best you can and turn it back on after you add bi carb, and a little soda ash.Thanks! He also told me to run my pump while doing it!
- May 23, 2015
- 24,379
- Pool Size
- 16000
- Surface
- Plaster
- Chlorine
- Salt Water Generator
- SWG Type
- Pentair Intellichlor IC-60
Before you do anything, please post a full set of chemistry test for the water and pictures of what it is you are trying to get rid of.
I would recommend you wait until other experts have had the chance to look at your pictures. A Zero Alkalinity treatment is not without danger to your plaster and you do not want to do one without good reason. The amount of time you wait is not a set thing. It’s based on what you see visually and I would never recommend going longer than 24 hours unless you see actual progress in the stain removal. If nothing happens in the first few hours then the treatment should be immediately terminated to avoid damage.
I would recommend you wait until other experts have had the chance to look at your pictures. A Zero Alkalinity treatment is not without danger to your plaster and you do not want to do one without good reason. The amount of time you wait is not a set thing. It’s based on what you see visually and I would never recommend going longer than 24 hours unless you see actual progress in the stain removal. If nothing happens in the first few hours then the treatment should be immediately terminated to avoid damage.
I am still researching it and will definitely post my numbers and pictures soon (hopefully tomorrow)! Thank you!