GLB Algae-X - 1 Qt. Type_Filter Accessories This 7CH-975 screws in with

This 7CH-975 screws in with a 1-1/2 inch SAE thread

The green mineral cartridge that pairs with it reduces the chlorine demand significantly

Plate: ALPL48C (circle)

and your spa is designed to run a pair for a full 100 square feet of filtration

GLB Algae-X - 1 Qt. Type_Filter Accessories This 7CH-975 screws in withGLB Algae X 1 Qt. Overview GLB Algae X is a long lasting, non foaming, multi purpose polymer algaecide. It is effective over a wide pH range. This product has been proven not to harm liners or affect swimmer comfort. It is easier to prevent algae growth than to destroy established algae, Algae X does both. It's the economical, all purpose algaecide. This product is compatible with chlorine, bromine, ozone, salt water pools, and biguanide sanitizers.