Pool store advice to lower alkalinity - three day muriatic acid dose method

[aquarium]

15,000 gallon IG plaster

Alkalinity here is naturally high out of the tap, pool tested at 220ppm. Their test said pH was 8.2, all mine say it's closer to 7.6.

Their advice: 1/6 cup muriatic acid in the water for one hour without the pump running then run pump for 23 hours, repeat, repeat. (Three days total)

Hardness is also naturally high, but a disproportionate amount is magnesium, almost a 2:1 ratio of calcium:magnesium when most waters are 3:1 or 4:1.

I don't see any scaling problems, so I'm not particularly worried about the alkalinity, but I am curious about the suggested method - anyone hear of this one?

[waterbear]

it's the 'accepted' method and it doesn't work very well. the idea is to pour a shot of acid in the still pool and the pocket of low pH will cause the carbon dioxide to bubble off....sort of like pouring vinigar on baking soda (which is pretty close to what your are doing!) I have read some descriptions of it where they say you can see the bubbling occur! You need to lower the pH and then aerate if you want to do it so it works!
See this thread
http://www.poolforum.com/pf2/showthread.php?t=191

[CarlD]

good way to remove the paint from the plaster.

Or melt a vinyl liner.

It's called the "slug" method and the ONLY way it works is if it inavertently brings you to the conditions that the aeration method uses.

[waterbear]

It's called the "slug" method and the ONLY way it works is if it inavertently brings you to the conditions that the aeration method uses.

I thought it was called the "slug" method because the guy who thought it up had the mentality of one!
(me bad!)

[aquarium]

Heh,

I'll live with it. I did turn the jets up so they break the water surface and cause some turbulence, but mostly for the 'water effect'.

[denanbob]

I received the same advice from our pool store. They said to add a cup of muriatic acid right near the return (I guess that is the closest to jet stream that I'll get). I guess I don't understand the difference between this method and the sticky post method. Is the difference just the aeration?