Any thoughts on loading up a pool with MA to clean bad dirt stains off the bottom of a Pebble Tech Pebble Sheen pool? Our pool flooded (Harvey) several months ago and the pool was cleaned (dirt and fish removed) and the chemistry was addressed. There are several large dirt stains around the plaster and, although the stains are not that bad, they are sizable and do need to be removed. However, they do not come off by brushing alone. A friend placed a 3" pvc pipe perpendicular to the bottom of the pool and poured some MA into it. After a few minutes the pipe was removed and so was the stain. I've heard that one way to clean the entire pool, after ensuring the water is correctly balanced, is to:
(1) turn off the pool throughout the process
(2) drop pH to 3
(3) brush the pool a few times a day for 3-4 days
(4) Bring pH back up with washing soda or soda ash
I have no reason to doubt the suggestion I outlined above as I trust the source however, I sure in the heck don't want to trash my plaster with an extremely low pH.
If this is indeed a proper way to do it, I looked at Pool Math and noticed some discrepancies. Using the upper areas of Pool Math (inputting data into the pink area for pH), in order to go from a pH of 7.5 down to 3, the suggested dose is 6195 oz of MA (given a TA of 90 and Borate of 0). However, using the lower Pool Math calculator (Effects of Adding Chemicals) I would add 431 oz of MA to get the same effect in pH drop of 4.5 (7.5 down to 3).
To move pH back up from 3 to 7.5, the upper area of Pool Math suggests adding 6803 oz of washing soda or soda ash. However, the lower Pool Math calculator suggests adding 477 oz of washing soda or soda ash.
Questions:
Is this a proper way to address dirt stains on the bottom of the pool?
Thinking about the potential cost of that much MA (48 gallons) and soda ash (425 lbs), is there a more cost effective way to do this?
Any other thoughts/suggestions?
Thank you!
(1) turn off the pool throughout the process
(2) drop pH to 3
(3) brush the pool a few times a day for 3-4 days
(4) Bring pH back up with washing soda or soda ash
I have no reason to doubt the suggestion I outlined above as I trust the source however, I sure in the heck don't want to trash my plaster with an extremely low pH.
If this is indeed a proper way to do it, I looked at Pool Math and noticed some discrepancies. Using the upper areas of Pool Math (inputting data into the pink area for pH), in order to go from a pH of 7.5 down to 3, the suggested dose is 6195 oz of MA (given a TA of 90 and Borate of 0). However, using the lower Pool Math calculator (Effects of Adding Chemicals) I would add 431 oz of MA to get the same effect in pH drop of 4.5 (7.5 down to 3).
To move pH back up from 3 to 7.5, the upper area of Pool Math suggests adding 6803 oz of washing soda or soda ash. However, the lower Pool Math calculator suggests adding 477 oz of washing soda or soda ash.
Questions:
Is this a proper way to address dirt stains on the bottom of the pool?
Thinking about the potential cost of that much MA (48 gallons) and soda ash (425 lbs), is there a more cost effective way to do this?
Any other thoughts/suggestions?
Thank you!
