GLB Super Sequa Sol (2 lb) (4 Pack) - Premium Water Soluble Fertilizer for Hydroponics, Gardening & Indoor Plants - Ideal for Vegetables, Herbs & Flowers

This concentrated granular is specially formulated to protect pool surfaces from minerals in the water and is ideal for use with hard water. It is also great for pool openings or when adding make-up water.

Helps neutralize small quantities of stain-producing minerals such as iron, copper or manganese that occur when adding make-up water or initially filling a pool

Compatible with chlorine, bromine, biguanide, ozone, salt water and mineral sanitizing systems

4 Pack