I have a Pentek 20" Big Blue Housing and I am installing an H2Only 100M-WP-20 Polypropylene String Wound Filter Cartridge, but the cartridge keeps falling to one side at the top and does not stay centered to meet the top connection. Is there something made that I should buy to hold the filter upright?
If you purchased the 100M-WP-20 then you purchased the wrong filter. This is a 2-1/2" x 20" filter and to fit a BB filter housing you need a 4-1/2" x 20" filter. The part number for this filter would be 100M-WP-20BB. This filter won't fall to the side like the previous filter.