I haven't been able to wash up because my arm was in plaster and I've never been told by the surgeon that I can resume the dishwashing I've been so longing to get back to
I now have a dishwasher
I would assume given the fact that you've not tried brick acid or used any acrylic sealers that you would need to top up the salt - what is the tds of the water in your area ? If its not too hard then it may be some time before you need to do it again.