Ultima 11. Won't backflush

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burbon44s

Candiru
MFK Member
May 13, 2012
919
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milwaukee
I've got an ultima 11 4000 I just tried to backwash and it's not working. Usually I can hear it spray in the filter, but tonight I can't, and nothing dirty in the sight glass.
Anyone ever come across this?
How can I fix?

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What pump are you running? I found that if I go too long between flushes, I have issues too... it takes about 100 gallons of back washing before you start hearing the media start kicking loose. This'll happen if your pumps are under flowed... I get around 3500GPH at the filter because of the massive resistance of my setup. These filters work much better 5000-6000GPH.

Just let it keep backwashing until it breaks up... if it never does you might need to remove some resistance somewhere or upgrade your pump.
 
The pump is a big dolphin. I thought it was 4850 gals/ hr
I've had it running for 1 1/2 years with no problems.
I always heard the flush right a way.

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Is anything coming out of the backwash dump hose?
 
What I do when I have that problem is to pull the head off and stick a hose down inside to loosen everything up. I let it run for a while to get all the pooty poo out. I have to do it every year on my koi pond.
 
evojoey said:
What I do when I have that problem is to pull the head off and stick a hose down inside to loosen everything up. I let it run for a while to get all the pooty poo out. I have to do it every year on my koi pond.
Click to expand...

I will try that.
I wonder if all my snails could be the problem

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The lateral stand pipe has a built in check valve. When in backwash mode it forces the water into the jets. Perhaps the check valve flipper is blocked or disloged.
 
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