Bestway sand filter sudden pressure increase

Pool pumps, pool filters and the plumbing of
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Pool Newbie
Pool Newbie
Posts: 1
Joined: Sat 09 Aug, 2014 13:11
My Pool: Bestway 12' surface
Bestway Sand Filter
Location: United Kingdom

Bestway sand filter sudden pressure increase

Postby _awn_ » Sat 09 Aug, 2014 13:13

HI all

I have a Bestway sand filter, the operating pressurr should be around 3.5 to 4 psi but I have an issue where it will run correctly for up to 1 minute then the pressure suddenly increases straight up to 6.5 psi.

If I power off and power on the filter, same thing happens again.

So far I have checked all fittings are securely fastened, check sand level, backwashed and rinsed several times.

I have run out of ideas! Any help would be greatly appreciated.


Swimming Pool Superstar
Swimming Pool Superstar
Posts: 912
Joined: Tue 06 Sep, 2011 05:48
My Pool: 10k inground fibreglass, Telescopic Cover, Hayward Powerline pump, Quality filter with glass media, 27kw output heat pump, K-2006C test kit
Location: United Kingdom

Bestway sand filter sudden pressure increase

Postby Denniswiseman » Fri 29 Aug, 2014 05:15


Is it critical that it operates at the lower pressure because 6.5 PSI seems quiet low any way.
The increase in pressure would be a restriction in the system. Is the suction and returns the same as before .
Have you changed the pump?
Have you put a calorifier in the system?
You could try restricting the flow to the pump with a valve but that could make it suck in air if you have any slight leaks.

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