Does anybody know a good brand of filter for the intake on a lake sourced irrigation system? The current filter, which is about 18 years old, is a plastic cylinder 33" by 4" with razor-thin slits and a 1 1/2" galvanized nipple for coupling to a check valve. The filter recently cracked and started to suck sand until I patched it. I would like to find a replacement just like it, but there is no label and we did not install the system. Thanks for any ideas.