Recently had the tile cleaned in the pool (had some scale) by a local pool store. Technician from store, apparently in a hurry simply poured 1/2 gallon of concentrate tile cleaner directly into pool and then brushed. Believe the concentrate should have been mixed with water or muriatic acid. As a result, I have had extreme foaming in my pool. Turn the spa on and foam comes over top of coping. Have had the pool store people come look at what happened and they have tried ridding the pool with anti-foam, etc, but to no avail. Do not want the pool emptied and refilled because of the high water table in the surrounding ground and afraid of pool movement. I have decided to try and solve the problem myself with all your suggestion, support and advice. The pool store that I dealt with has demonstrated their incompetence and do not feel comfortable having them continue to experiment with a "fix". My total chlorine level is 4.0PPM, Free Chlorine 4.0PPM, ph is 7.4, total alkalinity is 70ppm, calcium hardness is 285ppm, stabilizer is 100ppm, and total dissolved solids is 1900ppm. This foam,suds problem has been going on for about 5 weeks. The problem is lessening, but is there anything that I can introduce into the water to try and fix quickly. Have backwashed almost every week and added new DE.Think it helps?? Look forward to hearing from the many experts. Thanks !! (and HELP)