I am very happy to have discovered this site! My primary issue right now is that my 15 year old stainless de pool filter has sprung too many leaks for me to patch, so it's replacement time. I'm thinking about possibly changing to one of the quad de filters, as the Pentair brand should bolt right in where my old filter sits. The "sales literature" and the pool store "experts" make them seem like a great upgrade. I need some advise from some "real world folks" before I drop another thousand dollars into my pool equipment. Also, I need help in sizing recommendations ... My existing filter is a 72 sf unit. Thanks in advance for any guidance you would like to provide.