If you do pull apart the water strainer, be prepared to replace it. Ours was fine until
we checked it (while sorting out a failed
engine seacock) and then basically all the various bits which are supposed to form a seal
stopped doing so. It was impressive. The gasket had clearly been compressed, but cracked, and once uncompressed, came apart. It went downhill from there. We quickly decided to simply replace it. 20 year old metallic bits which are in a salt environment can easily be dodgy.

- David