Quote Originally Posted by mas985 View Post
That pump could easily deliver 60 GPM so a 22" is barely large enough but it would probably work ok.

Also, the 18" may of cracked because of the excess stress put on it by the pump. What was the filter pressure before?
The gauge didn't work so no idea.

The stress is caused by the water trying to go through the sand? Would it be better to leave the solar heater on all the time since it has to go through more pipe? Would that relieve the stress? The bigger the sand filter = less stress?

Thanks