Harmsco ST-155 Spa/Pool Replacement Filter Cartridge zodiacjandylaars matching the correct internal configuration

matching the correct internal configuration can be just as important as replacing the switch itself

A trim kit like this is often one of the simplest ways to make the spa feel fresher without rebuilding the entire jet assembly

Supports a cleaner and more dependable installation

An impeller like this is useful because it helps generate the flow needed for the booster system to perform as intended

Its design ensures reliable operation over time

Harmsco ST-155 Spa/Pool Replacement Filter Cartridge zodiacjandylaars matching the correct internal configurationThe Harmsco replacement filter cartridge is designed for compatible ST 155 filter applications where the internal filter element needs replacement. A filter cartridge is useful because it helps capture dirt and debris from the water flow, supporting cleaner water and more dependable filtration performance. This replacement is especially useful when the original cartridge is torn, clogged beyond cleaning, collapsed, or no longer filtering effectively.