I'm working on an inground pool 20,000 gallons, D.E. Filter, Whisper Flow 11/2 H.P. with heavy calcium deposits on the blue tile. I purchased GYSAR "F" Tile Brite Tile Cleaner as recommended to clean the tile. I used 1/8 gallon of GYSAR to 1/16 gallon of muriatic acid & it created alot of foam. I called the manufacturer, because there were no instructions on the bottle & no ingredient list. They told me to use a defoamer to get rid of the suds. So, I purchased "Arrow Spa" defoamer. I have used almost a full gallon of the defoamer over a 4 day period & still have suds.
Any recommendations as to how to eliminate the suds/foam? I did not take the water chemistry prior to adding the products. Prior to cleaning the tile, I've had the pool at a low shock for 5 days.