Rainbow / Waterways DSF 50 Sq Ft Generic Cartridge (set of 2) Monarch Spa Apera pH Electronic Pen Tester

Apera pH Electronic Pen Tester details:

5 meters above ground level to protect it from splashes

Only use quality spares for longer life and correct fitting

It is important to visually inspect the clear cell housing every few months

The chlorine gas instantly dissolves into the water as free chlorine (hypochlorous acid)

Rainbow / Waterways DSF 50 Sq Ft Generic Cartridge (set of 2) Monarch Spa Apera pH Electronic Pen TesterThe Rainbow Waterways DSF 50 Sq Ft Generic Cartridge is engineered using easy to clean and highly durable Reemay materials. Designed to meet or exceed OEM standards, enjoy the same performance as genuine filters, but for less. Our high quality cartridges are your solution for pristine, crystal clear water. Waterways DSF 50 Spa Filter Replacement Cartridge Generic details: High quality cartridge made with Reemay filter material Won't ravel or fray