I'm working with a commercial pool that is in rough shape. We have 3 large Pentair Triton II sand filters that I'm thinking are about 25yrs old. I don't think they've ever been cleaned or had a sand swap.
Doing some research on here, most people seem to be of the opinion that sand never seeds swapped - just cleaned. I think it this situation it makes more sense to swap the sand, as labor is the biggest expense.
So my question, what all is involved in replacing sand? Is there anything else I should be doing with these filters, like a deep clean of sorts?
I had a commercial pool contractor come out and give us a quote .... $5300 for new sand and 3 new multiport valves (ours are in bad shape). I think this is really high, especially when we have a crew of mechanically/plumbing inclined guys who can always use a winter project. If it is an easy process, we could save a good bit of money doing it in house...but I also want it done correctly.