Added 2# of Ascorbic Acid tonight

[smallpooldad]

You first need to drop the chlorine to 0, yes Zero, or all the AA will do is eat the chlorine and not the stains.

pH to 7.0 for gunite, 7.2 for vinyl/fiberglass.

You will need 1 1/2 to 2 lbs of AA per 10,000 gals depending on how bad the stains are.

You also need to add immediately 1 bottle Algaecide 60 not 50 or below (per 10,000 gals) , they normally contain metals to prevent an algae bloom.

Also add immediately three/four bottles of Metal-Out (per 10,000 gals) or stain treat to put the metals in suspension or the will redeposit on your walls.

After 24 to 48 hours drain the pool and acid wash the walls (1 part acid to 3 parts water), once the pool has drained near to the bottom abou 1 ft. of water left. This removes stubborn calcium and algae stains. Spray the walls with water 30 seconds after you have acid washed them.

NEVER ADD WATER TO ACID ONLY ACID TO THE WATER OR IT COULD EXPLODE AND BLIND YOU.

ALWAYS WEAR PROTECTIVE CLOTHING AND GOOGLES WHEN DOING THIS AND HAVE SOMEONE ON HAND TO SPRAY YOU WITH WATER IF AN ACCIDENT HAPPENS

BE VERY CAREFUL TO ADD SODA ASH TO the little pool water (1 ft.) that is left before acid washing to NEUTRALIZE THE EFFECTS of the acid water or you could burn out the bottom of your pool.

2/4 medium-size saucepans full of soda ash should do it.

If you have a vinyl pool you may need to do exactly the same treatment using Oxalic acid as the stains are of a different nature.

If this does not work you may have tannin stains. Then raise the chlorine to 20 ppm (gunite pool), 15 ppm (vinyl pool), and maintain for 4 days this should help dissolve them.