I hate to vacuum, and hate it even more when having issues. I have a 2 speed pump on a Hayward EC50 earth filter. I setup for the season yesterday, went to vacuum and what ever I do I loose prime in the pump basket.
I took the whole filter apart and realized that the union between the pump and filter was cracked. Replaced that, removed all shut-offs, cleaned lubed and new teflon tape on the threads, and replaced the basket cover on the pump for good measure, (31.00 dollars, the insanity). Put it all back together, recharged the filter, tried to vacuum again, same results. I was able to vacuum in 5 minute intervals before having to reprime the pump again, and that is only on the slow speed. High speed there is no way.
I am hoping that someone out there has seen this and resolved it.
Thank in advance.