filter leaking

There must be something wrong with your main valve. First make sure it is in the right position. Assuming there is nothing obvious out of place then next place to look is the spider gasket on a multi-port valve or the O-rings on a push/pull valve.
 
When my O ring on pump goes bad-
It will allow water to leak out - after backwashing
It is like the backwash doesn't turn off

I can go a summer, with one o ring on my chlorinator-
Then I may need to change it 3 times in 6 weeks...
$19 each- any idea what may be making them go bad?
 
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