Quote Originally Posted by PoolBoy48 View Post
Is there a simple explanation for this?
Probably. But without seeing your piping and filter, and knowing your pool layout, it's hard to tell.

There are a bunch of videos on YouTube, but most of the ones we've looked at are pretty bad. However, this service guys videos are much better than average, and he covers a number of possible issues with priming or pump behaviour:

MrDgvb1
https://www.youtube.com/watch?v=_k-B...4D975AEA898B07