Natural Chemistry 1.75 lb Stain Free

Stainfree – Extra Strength quickly removes stubborn metal stainsStainfree Extra Strength is a premium stain fighter that contains 100% ascorbic acid. It quickly removes metail staining without adding phosphates to your water. It is ideal for treating staining on all pool surfaces. Use with Natural Chemistry’s Metalfree™ and you have the ultiimate 1-2 combination for stain fighting!Features: 100% ascorbic acid-premium stain fighter! Safely removes metal stains from pool liners and finishes Quickly removes stubborn stains Compatible with all sanitizing systems Directions for use: 1. Balance pool water chemistry before using Stainfree Extra Strength: pH – 7.2-7.6; Alkalinity – 80-120 ppm; Calcium Hardness – 200-400 ppm; CYA below 50 ppm; Phosphates – below 100 ppb (Stain removal products work best when the pH is on the lower side of acceptable range – 7.2).  Important:  Before starting the metal stain removal or water discoloration process (step 4), a pulp based filter aid must b