I got the following from my pool maintenance company? (Pentair DE filter)
It seems from reading here and on the web, it doesn't seem to be strict guidelines on this -- seems they can last signficantly longer. They can be cleaned (per the tutorial on this forum) and only need to be replaced if there is a tear, or if things seems to be getting through. Is this just BS by the pool company trying to get $300 from me? Or does Pentair actually recommend this (I'm going to give them a call shortly).This e-mail is to inform you that your DE filter elements need to be replaced. The manufacture suggests that your filter elements be replaced every 3 years, as a courtesy to you we backwash your filter every two weeks to try and stretch its life for as long as possible. These are important to have replaced because they help deliver better water flow rates that help enhance your filtration. They also help reduce any wear and tear on the pump, and allows them to use less energy and provides a longer life to the cartridge. The cost of DE Filter element replacement is $425.00plus tax. If you could please contact me and let me know you are ok with us replacing your filter elements at this time it would be greatly appreciated. Thank you for your time and consideration.
The current pressure is running around 13 (not sure if it was backwashed today or last week) so it doesn't seem like there is any performance issue currently.
Should I replace filters, wash filters, or just leave them alone?