Sand Filter PSI increases after backwash

atxjhawk

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Oct 12, 2016
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Austin TX
Hi all.
I have a Tagelus TA 50 Sand filter. The pump pressure increases two-three PSI after I backwash it. That seems counter-intuitive to me. What might cause that?
Thanks,
Steve
 

pabeader

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May 14, 2015
4,349
Cartersville Ga
I've read of a few that do that. It seems that some filters have the gauge on the output side of the filter, rather than the input side.

What happens if you block one of the returns?
 

duraleigh

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Apr 1, 2007
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Sebring, Florida
The position of the gauge is not relevant to psi. That said there is no reason to put the gauge between the filter and pump. Regardless, it has no effect.

I have no idea wht you are seeing a decrease in pressure. How much are you letting it rise before you backwash?
 

mas985

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May 3, 2007
12,382
Pleasanton, CA
Are you sure the filter is plumbed correctly? Post a picture of the pump and filter setup.


The position of the gauge is not relevant to psi.
It most certainly is. If the gauge is before the filter, as the filter gets dirty, pressure will rise. However if the gauge is plumbed after the filter, pressure will drop.

However, I never heard of a filter that has a gauge after the media unless it was plumbed backwards.
 

duraleigh

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Oops! I had to think about that for several minutes but I am wrong......the gauge before or after the filter will make a difference in psi.
 

atxjhawk

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Oct 12, 2016
8
Austin TX
Thanks for all the ideas.

It looks like the gauge is attached to the filter; the filter was turned-off at the time of the photos. I cannot tell from the photos where it is relative to the filter.

The filter was running at 20 psi when I decided to backwash it because of some debris in the pools.

Steve20170504_130711_resized.jpg20170504_130657_resized.jpg
 

mas985

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May 3, 2007
12,382
Pleasanton, CA
Well it looks like it is connected properly. So right now the pressure is 23 PSI? Try backwashing again, and then rinse and see what happens to the PSI. Tap the gauge at each step to make sure it is reading the correct pressure.
 

woodyp

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Apr 17, 2010
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East Texas
Well heck.......I thought they were all directly on TOP of the filter body someplace.
 

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