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Be careful not to crossthread or overtighten the cartridge. 5. Carefully screw the filter body into the filter cap and wipe the housing clean with a damp cloth. The filter should now be ready for pressurisation. 6. With the tap/faucet in the on position, gradually turn the main water supply on until the flow from the tap has been stabilized. 7. Close the filtered water faucet and ensure that there is no water leaking from the system joints. 8. When the system has been confirmed watertight,