I have a new Pentair Quad 100 filter and Intelliflo VS pump. When I open the pump to clean the basket, I hear a constant gurgling/bubbling sound, and the water level in the pump drops pretty much all the way down to the bottom. Is this normal? There is a check valve up stream of the pump, so I believe everything is plumbed correctly. I'm wondering if the water in the filter (which is higher than the pool) is "falling" down into the pool, which in turn creates a suction that pulls the water out of the pump when the basket is opened. Is this what is happening, and is it normal for this to happen in a correctly plumbed system where the filter and pump are at the same level as the pool deck?
When I re-attach the pump basket cover and start the pump up, it re-primes fairly easily, but I get some very large DE plumes in the pool at the returns. I assume that some DE is "falling off" the filter cartridges during the "gurgling," and that this results in the DE plumes when the pump is turned back on, but my questions are 1) is this normal, and 2) is there a way to stop this? I was thinking that I could turn the hi-flo valve to the "off" position in order to prevent this from happening. Would this close the connection between the pump and filter, thereby preventing the water from being pulled out of the pump? Is this a reasonable approach to solving this issue, or is there something that needs to be "fixed"?