Hydronix - CB - 20" x 4.5" Coconut Carbon Block Filter POOL AND SPA TEST KIT This sleeve creates a watertight

This sleeve creates a watertight barrier between the UV lamp and the water stream while allowing UV-C light at 254nm to pass through with minimal loss

Patented Free Chlorine indicator resists interference from monochloramines

Fluoride reduction

01 pH Accuracy at 25°C ✓ Premixed & Ready to Use ✓ 20 Single-Use Pouches

Hydronix - CB - 20" x 4.5" Coconut Carbon Block Filter POOL AND SPA TEST KIT This sleeve creates a watertightHydronix CB Series CB 20" x 4. 5" Coconut Carbon Block Filter High purity coconut shell carbon block engineered for superior chlorine reduction and exceptional dirt holding capacity in whole house, well, and commercial filtration systems Coconut Shell Carbon Multiple Micron Ratings Low Carbon Fines High Chlorine Reduction The Hydronix CB Series carbon block delivers professional grade filtration performance at a practical cost. Available in 1, 5, and