Installation of water filters

Submitted: Sunday, Jul 25, 2010 at 18:43
ThreadID: 80299 Views:2573 Replies:9 FollowUps:2
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I am wishing to install two water filters into our van and want to know weather the 12v pump is strong enough to do the job. The pump is a Flojet 4406, 35PSI and 12.5 LPM. I want to have a 5 micron sediment and a charcoal filter and use the pump to push the water through the filters to the sink.

cheers


Shane.
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Reply By: cbucko - Sunday, Jul 25, 2010 at 18:59

Sunday, Jul 25, 2010 at 18:59
From my time in the boating industry, I can say that you will have no trouble with that pump pushing water thru the filters.
AnswerID: 425187

Reply By: Member - Andrew (QLD) - Sunday, Jul 25, 2010 at 19:19

Sunday, Jul 25, 2010 at 19:19
Check the specifications on your filters as they may require a higher pressure for the sediment filter side. What brands are the filters for reference?

From one filter supplier's FAQ:

- ..... it does depend on what system you select and what size your pump is. A carbon filter offers no resistance whereas the micro filtration requires a pump capable of around 45 p.s.i.

Not exactly "no resistance" but generally on the money IMO. The smaller the filter membrane the more pressure required.

YMMV :)

Hope that helps,
Andrew
AnswerID: 425193

Reply By: Notso - Sunday, Jul 25, 2010 at 20:24

Sunday, Jul 25, 2010 at 20:24
It will do it no problems, just make sure you put the sediment filter first in line
AnswerID: 425200

Reply By: chips59 - Sunday, Jul 25, 2010 at 21:20

Sunday, Jul 25, 2010 at 21:20
Thanks for replies.


Shane.
AnswerID: 425207

Reply By: kend88 - Monday, Jul 26, 2010 at 07:28

Monday, Jul 26, 2010 at 07:28
I installed two filters just before the cold water tap at the sink in our caravan. The flow has reduced by about 80%, but it is the same flow whether connected to a water supply or using the pump and onboard water tanks. The filters I have apparently need the flow to be slower to be effective.
The hotwater tap, without filters, flows at the faster rate. If we didn't have that, it would be a bit of a pain.

KenD
Bris
AnswerID: 425230

Reply By: Peter_n_Margaret - Monday, Jul 26, 2010 at 08:26

Monday, Jul 26, 2010 at 08:26
Shane, we use exactly those filters (full size houshold style CUNO) and a similar pump (not sure of model number). There is a flow reduction, but it is quite satisfactory.
We have 2 quite seperate systems for washing and drinking water, but you could plumb yours from a single pump so that the shower by-passed the carbon filter, but drinking water taps used both ("T" off the washing water from between the two filters). That way the shower would have better flow and the carbon filter would have less water throught it.

Cheers,
Peter
OKA196 Motorhome
AnswerID: 425236

Reply By: Member - DAZA (QLD) - Monday, Jul 26, 2010 at 10:00

Monday, Jul 26, 2010 at 10:00
Our plumbing company services over 90 water coolers every 3 months for a federal govt agency and we replace the filters at each service, the recommened pressure for filter housings is 350 kpa so we install pressure limiting valves re 350 kpa,most late model caravans are fitted with the above valves, some have different pressure ratings.

Cheers
AnswerID: 425243

Reply By: chips59 - Monday, Jul 26, 2010 at 18:57

Monday, Jul 26, 2010 at 18:57
Thanks all, the two filters I have are the same as the house hold ones, 5micron sediment and carbon one. I have no shower or toilet so its just the sink and the front tap on the drawbar. So I think the drawbar line will come off before the filters so no waste there.
The bride has Irritable Bowel Syndrome so this is to help her and stop carting 100 litres of spring water every time we go away.

Some one suggested getting a pura tap set up but not sure how that would go.

cheers

Shane.
AnswerID: 425293

Reply By: Member - Alan John C (WA) - Monday, Jul 26, 2010 at 20:03

Monday, Jul 26, 2010 at 20:03
Shane why not put your filters prior to your tanks then the pressure of filling them will solve the problem and you will not lose pressure to your taps and at same time keep your tanks clean.

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AnswerID: 425307

Follow Up By: chips59 - Monday, Jul 26, 2010 at 20:29

Monday, Jul 26, 2010 at 20:29
Good point. but as we quite often can only go away in the winter/wet season we have set up a catchment system so the roof catches the rainwater and goes into the water tank.

cheers.


Shane.
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Follow Up By: Peter_n_Margaret - Monday, Jul 26, 2010 at 21:09

Monday, Jul 26, 2010 at 21:09
I disagree.
You want good water coming out of the tap. It matters little what the water in the tank is like, and bugs grow in tanks. We chlorinate our water as we add it to the tank, and the carbon filter takes the chlorine out just before it comes out of the tap.

Cheers,
Peter
OKA196 Motorhome
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