I'm a relatively new owner of a relatively old pool. It has a Haywood Pro series - S311SX sand filter. I finally let the pool guy that came with the house go so he could expand his horizons on someone else's pool. I replaced the pressure gauge on the sand filter and it never changes. Always 18 psi. I assumed I had channeling through the filter so I opened it up. The sand looks almost like its new. In other words, either my water never gets dirty or the filter isn't filtering much if at all.
If I can figure out how to include an image with this post, I'll show it to you, however, it appears there's about an inch of so of what appears to be one of the bottom laterals sticking up through the sand. If my assumptions on how this thing is supposed to work are correct, this lateral is serving as a direct bypass of the sand.
Is my reasoning correct?