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Open Roads Forum  >  Do It Yourself Modifications and Upgrades (DIY)

 > Water filter upstream of the pump?

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Almot

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Posted: 12/11/19 01:32pm Link  |  Quote  |  Print  |  Notify Moderator

Thinking to add a sediment filter (and a proper strainer instead of a tiny strainer that came with my pump).

With my plumbing it's easier to install it upstream of the pump: tank -> 50 or 100 micron strainer -> 5 micron sediment filter -> pump.
I see most people installing filter downstream of the pump: tank-> strainer -> pump -> filter.

Is there any reason not to install the filter upstream, other than risk of pump running dry when filter clogs?

Also, what is your experience with <= 0.5 micron block carbon filters after sediment filter - is water pressure still tolerable? Shower is where my pump is definitely struggling. As much as I don't want any cr-ap on my skin and on remaining hair, I have doubts about carbon in this scenario.

mobeewan

Hampton, Va

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Posted: 12/11/19 02:52pm Link  |  Quote  |  Print  |  Notify Moderator

The pump may have a harder time pulling liquid through a filter as opposed to the simple strainer. Prefilling the filter might help to get the flow started.

Lwiddis

Monterey, CA

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Posted: 12/11/19 06:19pm Link  |  Quote  |  Print  |  Notify Moderator

Does the pump manufacturer have a position on filters and/or where to install?


Winnebago 2101DS TT & 2020 Chevy Silverado 1500 LTZ Z71, 300 watts solar-parallel & MPPT, Trojan T-125s. TALL pole for flags. Prefer USFS, COE, BLM, NPS, TVA, USF&WS, state & county camps. Bicyclist! 14 year Army vet - 11B40 then 11A - (MOS 1542 & 1560)


beemerphile1

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Posted: 12/11/19 06:39pm Link  |  Quote  |  Print  |  Notify Moderator

Tried it, pump continually cycled at an extremely rapid rate. I believed it would destroy something if allowed to continue.

I now use a sediment filter when filling the tank and a .5 carbon block filter in the kitchen which only feeds a separate faucet at the kitchen sink.


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Almot

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Posted: 12/11/19 06:51pm Link  |  Quote  |  Print  |  Notify Moderator

beemerphile1 wrote:

... a .5 carbon block filter in the kitchen which only feeds a separate faucet at the kitchen sink.

This would complicate the layout but I like the idea.

Bobbo

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Posted: 12/11/19 08:07pm Link  |  Quote  |  Print  |  Notify Moderator

I use a whole house filter between the tap and the RV. If filling the fresh water tank, I use the whole house filter before the water goes into the tank.

In 2009 we went to Fort Wilderness at Disneyworld. I hooked to their shore water without a filter. I sold that RV in 2017 and it still had sand in there. That is why every drop of water that goes into my RV plumbing goes through that whole house filter.


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C Schomer

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Posted: 12/11/19 08:59pm Link  |  Quote  |  Print  |  Notify Moderator

It's common to have a strainer at the inlet of a pump but other than that you never restrict the inlet. Craig

SDcampowneroperator

South Dakota

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Posted: 12/11/19 09:14pm Link  |  Quote  |  Print  |  Notify Moderator

Ask the camp. You may not need any, especially if on city water.

DFord

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Posted: 12/11/19 09:23pm Link  |  Quote  |  Print  |  Notify Moderator

It's much easier to pump water than it is to pull it. Ie: You can only life water about 24 feet (before the column separates) but you can pump it as high as you want depending on the construction of your pump (think deepwell pumps). RV pumps aren't designed to pull water very far - they are usually installed below the level of water in the fresh water tank. Mount your fine filter in the discharge of the pump but don't expect to pump the kind of a stream you'll want at your faucets - it will more than likely dribble out of the faucets.

I run all the water I put into my RV through a cheap charcoal filter - it removes all the bad tastes. I also have a 0.5 micron filter for a drinking water spigot at the kitchen sink but mostly we buy RO water at local stores for drinking and cooking.


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valhalla360

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Posted: 12/11/19 10:36pm Link  |  Quote  |  Print  |  Notify Moderator

It's basic hydro...

In order to push water thru the filter, the upstream side pressure has to be higher than the downstream side. If the filter clogs, it needs a bigger pressure if you want any significant amount of water to pass thru.
- Upstream of the pump is gravity fed. Let's say you have a really deep fresh water tank (2ft deep) and it's full to the brim and the filter is flush with the bottom...2ft of head will generate about 0.9psi. So the theoretical max pressure differential across the filter is 0.9psi..though in reality it will be less as you won't be able to drop it to 0.0psi if there is water flowing and most tanks are not always full nor are they 2ft deep.
- On the downstream side of the pump, the pumps generally put out pressure somewhere on the order of 30-50psi...that's a lot more pressure available to push water thru the filter while still retaining enough pressure to send the water to the various outlets.


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