Easy Care™ Scaletec Plus® 20064 .5 Gallon Surface Scale & Stain Remover is a high performance swimming pool calcium descaler, iron stain, scum remover and preventative. First pourable product that removes hard water buildup on pool surfaces, tile and equipment without scrubbing or acids. Unique Synertec® formula removes both new and old white calcium and mixed composition scales and metal stains. Scales and stains are both loosen from surfaces and re-dissolved into pool water which are filtered away or kept in suspension.