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UK Window Cleaning Forum => Window Cleaning Forum => Topic started by: p1w1 on August 12, 2016, 04:22:00 pm

Title: mains pressure after pre filters
Post by: p1w1 on August 12, 2016, 04:22:00 pm: Anyone have an idea how much the mains water pressure will drop after going through 1 off each 20" sediment & carbon filter. Trying to get an idea if i can get away with using a booster pump as i'm going to upgrade to a 40-40 before winter and i'm presuming the mains pressure after pre filters is what should be measured before choosing a membrane (i dont currently have a pressure gauge to test) just looking at a general figure.

cheers
Title: Re: mains pressure after pre filters
Post by: slap bash on August 12, 2016, 05:14:07 pm: I remember testing my water pressure ant it was 48 psi so not good at all, but every tap will be different.
Title: Re: mains pressure after pre filters
Post by: Soupy on August 12, 2016, 05:17:44 pm: There should be very little drop off after a sediment filter, mine is 0.

Carbon filter, not sure but I'd imagine very little.
Title: Re: mains pressure after pre filters
Post by: p1w1 on August 12, 2016, 05:19:17 pm: Quote from: slap bash on August 12, 2016, 05:14:07 pm
I remember testing my water pressure ant it was 48 psi so not good at all, but every tap will be different.
yes mate, I probably haven't explained properly i mean what is it out the tap and then after the pre filters i'm trying to get an idea on how much it drops if at all.
Title: Re: mains pressure after pre filters
Post by: p1w1 on August 12, 2016, 05:20:05 pm: Quote from: Soupy on August 12, 2016, 05:17:44 pm
There should be very little drop off after a sediment filter, mine is 0.

Carbon filter, not sure but I'd imagine very little.
Thanks Soupy
Title: Re: mains pressure after pre filters
Post by: Spruce on August 12, 2016, 05:24:26 pm: Quote from: Soupy on August 12, 2016, 05:17:44 pm
There should be very little drop off after a sediment filter, mine is 0.

Carbon filter, not sure but I'd imagine very little.

Agree.

When the prefilters are new there is no difference in reading between the two on my 4040.

Once the sediment prefilter gets clogged then the reading after the c/b drops.

Sediment prefilter 5 microns. Carbon block 5 microns.

I once used a 1 micron carbon block prefilter and the difference was slight to begin with and became worse as the c/b also got clogged up with sediment.

Our water is very sediment laden sometimes.

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Title: Re: mains pressure after pre filters
Post by: slap bash on August 12, 2016, 05:26:25 pm: The pressure will be the same its the flow which might drop. Two very different things. It`s for this reason you don`t need to put a pump in front of filters vessels. They do not have back pressure.
Title: Re: mains pressure after pre filters
Post by: p1w1 on August 12, 2016, 05:30:05 pm: Thanks guys
Title: Re: mains pressure after pre filters
Post by: robert mitchell on August 12, 2016, 05:56:40 pm: Quote from: slap bash on August 12, 2016, 05:14:07 pm
I remember testing my water pressure ant it was 48 psi so not good at all, but every tap will be different.

lucky you ......mines 21 psi!
Title: Re: mains pressure after pre filters
Post by: jk999 on August 12, 2016, 07:07:51 pm: My tap pressure is 115 psi from tap