Is there any way to prevent calcium carbonate build-up at the water line?
I recently became a sub-contractor for a pool that has an owner that wants a "Scale-Stain Controller" to be added to the pool.
It claims the following:
Absolutely phosphate free formula.
Aggressively prevents and removes scale and stain buildup.
Salt cell de-scaler (without acids), protector and prolongs cell lifespan.
Controls calcium (up to 1,000 ppm) and hard silicates (up to 300 ppm).
Strongly sequesters iron, copper, and manganese metals.
Protects all equipment: filter, heater, water auto-leveler, salt cell, and solar unit.
Provides long lasting protection: pool finish, tile and equipment.
Affordable year-round protection.
Extends life of salt cell generators.
Prevent future costly washing and tile cleaning.
Advanced Synertec formula is both acid-free and phosphate-free.
Chlorine stable multi-polymers lasts for months, not weeks.
It seems like snake oil.