I am changing the sand in my Hayward filter, as I don't know when the previous owner did it, and I'm on my 3rd year of ownership. The old sand doesn't look too bad compared to the new stuff, just a little yellow and clumpy at the bottom.
Anyhow, I took the laterals out to clean them, and facilitate removal of all the sand. I noticed that the pipe going from the multi-port, down the the laterals had a crack in the bottom. Now, where the crack is, is where the water would distribute to the laterals, below that is only a hollow space, then back to the sand filter via a cover of the hollow area. (Am I making sense?)
In my opinion, I don't need to worry about it, I may just put a little silicone over the crack and reinstall it. The hollow area had sand in it, I'm assuming for weight to hold the assembly down while refilling the sand.
Am I on the right track?