Hi, I am new here and have read and learned a lot from this site, so I thank you all for that.
I am seeking advise because the pool store has me spending big bucks and I am not so sure it is necessary. To my utter dismay, I opened my pool this year to a swamp. This has never happened to me before, so I am completely overwhelmed. I live in Ohio and our winter temps hit below zero often. After filling the pool, we noticed that there was water dripping from underneath the skimmer. At first you couldn't see any cracks but since the pump has been running, now you can see a couple of them and water is out of those cracks at a steady rate. I just bought a new skimmer but have yet to install it. As of right now, my pool is still green after balancing the water, getting debris out, scrubbing it, adding Green to Clean (recommended by pool store), and shocking the heck out of it. What I notice is that the pressure coming out of the return is low. If I backwash and turn the filter back on, it increases the pressure coming through the return but it only stays that way for an hour or so. The start up psi is 8 and it is at 10. I only backwashed to see if it would increase the pressure. I told the guy at the pool store what was going on and he told me it had nothing to do with cracks in my skimmer. He said I need a new multiport valve for my filter. I have a Hayward sand filter and Hayward pump that I replaced in 2010, so they both are 4 years old. My above ground pool is 18,000 gallons.
Could the low pressure be the multiport valve? I've read other threads and checked baskets, lines, etc. Nothing is clogged.
thanks for any help!