Pleatco PFS3060-EC DE Grid Filter Replacement for Unicel FS-2005 & Filbur FC-9550 - White Pool Filter Cartridge for Swimming Pool Maintenance & Spa Cleaning

I used these to replace an old filter assembly on a Hayward Pro Series 6020DE filter. The old filter grids were unknown age, but had cracked pieces inside and a couple of tears/holes in the fabric. I was noticing haziness in my pool that wasn't clearing with chemical balance or repeated filter backwash/cleanings, and guessed that it was probably DE leaching back into the pool from the old failing grids.I undid the entire assembly and ordered these to replace the old grids. Re-assembling was not an easy process, but that is not unique to this product and more of a comment about pool filter assemblies in general. To put it back together, I notched the "short element" first (this is the filter that is not quite as wide as the others - there is only 1 of them in the box). Notch it in correctly by finding the "opening" in the bottom circular piece of the assembly - it looks like a pie with a triangle cut out, that is your opening. Count 3 notches (L shaped corners inside the circle) to the right, and fit your short piece in so that it comes to cover half of that original opening. After that, just keep notching the larger pieces in the following corners to create a spiral pattern. Re-position your top piece and wiggle them in one by one into the circular openings - once they're all fit back in, screw it down with the nut until it's all nice and secure.After 1 day of replacing the filters with these, my pool haziness cleared up and it was crystal clear to the bottom again. I have only had them a week, so I can't speak to their longevity. However, they seem to be made of good quality fabric and I hope they will last several years with proper care.