Thanks for the tips.
Stupid question, but whats the best way to get the tubes off without water going everywhere? My filter is in the cabinet. In & out pipes can be locked off so the filter can be cleaned, so the water stays in the tube - is it a case of locking off pipes, get filter out of the way & unscrew the pipes over a bucket to catch all the water - OK, but am a little worried about potential for water spillage going near the electrics.......