So the isle of wight is one of the hardiest water areas in the uk if I put a salt sofner filter on a di kit how long will 2x 25ltr resin filters and a 30ltr salt filter last me in weeks / months. Got a DIY kit all priced up but conflicting advice from 2 stockists. And no way hers in doors will be happy If I puck a 1000ltr tank in garage!!! Any advice lads?????