So I'm getting things in order to open our pool and I take my old filter, which came from the exact same store when they installed our pool, back to the store so I can be sure of getting the correct one for replacement. It's clearly a Unicel but it has no other markings on it whatsoever. Its 6 " in diameter and 26 " long, not counting the semi-circle handle on top and the white male adapter on the bottom. I asked the owner if he knew the part number, he told me he didn't know what the part number was but that it was a 100 sq ft filter. I asked him how does he order that part for his store without using the part number and he ignored me but spoke up clearly to tell me that the filter was $149.50, that's when I walked out...I'm pretty sure the replacement filter isn't THAT expensive. Can someone help to identify it so I can buy it somewhere else? I hope my pictures will attach...