I just finished hard plumbing my mother in laws new sand filter and pump, when we ran into some unexpected problems... After I added sand, I attempted the initial back wash but was not getting any water from the waste port. Water continued to flow back to the pool, through the return line, but at a lower pressure. The only way I could get it to back wash correctly was to shut the valve on the return line, and depress and hold the handle on the multi port valve. The same conditions for rinsing. Filtering seems to be going normal so far though. I took apart the valve and the spider gasket seems to be in good shape. Any thoughts? Thank you
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