Okay, I have no idea how I did that. I thought I was posting a reply to the existing thread of the same title. Please delete or move this post as needed. My apologies.
Not meant to hijack or anything ...but I also have a similar two filter for 1 pool question.
I have been using a 200lb. sand filter for about six seasons on our 24' round aboveground pool, but recently picked up a hardly used Hayward EC50 DE filter & 1HP Matrix pump (pretty cheap). Since I can't use my suction side manual vacuum head or Aquabug anymore with DE , here's my question;
I have an Aqualuminator return, so I would need to spend $40 bucks for the Pentair pressure side adapter plus another $180 or so, for a Polaris 65. So, instead of selling my old setup, I was thinking of splitting the skimmer line with a "Y" and just using my sand filter for vacuuming. Either vacuuming to waste, or tossing a return hose into the pool just when cleaning.
As long as I put a ball valve before the pump basket on the sand filter, are there any potential problems using it as a maintenance filter and not in a closed loop as it was designed?