TLC® removes oil, grime, and mineral scale from common pool and spa surfaces such as tile, vinyl, and concrete. Extra strength, concentrated thick formula clings to upright surfaces longer for more effective cleaning power. TLC® can be diluted for lighter soils on surfaces, is easier to use, and is more effective a cleaner than muriatic acid. Available in 1 gallon bottle, or a 4 X 1 gallon case.