This tight micron pleated cartridge is ideal for 'very fine filtration tasks'.

Can be washed.

When fittings always relubricate the sump Oring and threads, to enable sealing from hand tightening the sump. This avoids flattening of the Oring due to 'overtight'.

Always purge before finishing your systems cartridge change, to avoid unnecessary air spurting through your household taps.

Sumps tighten from the effect of water pump pulsation.