For testing for combined / total chlorine using photometer - electronic test kit

Tablets to test for free chlorine using a photometer - electric test kit.

Chlorine Free 4.5kg box with 12 tablet duos. Duotab combines three different treatment steps: water disinfection, algae prevention and clarifier. One duo tab per week for every 30m3 of water. Tablets disolve fast with no residue. Please note: a floating dispenser is required for this product (ENVIRONMENTALLY HAZARDOUS SUBSTANCE, SOLID, N.O.S. (Polyquaternary ammonium compounds)