Clean It Up
UK Window Cleaning Forum => Window Cleaning Forum => Topic started by: Dazzler3370 on November 22, 2015, 08:20:31 am
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Hi Sean you seem to be the man in the know about 40 40 Ro systems
I've currently got my set up with 3 pre filters one has a clear casing and the other two are together in a set with blue casing but I've no idea which is which.
And then my main Ro filter which I do know is for low pressure system My tap water comes out at 300
Recommendation from VYair who I bought the system off tell me I should change all my pre filters every 8 weeks and my main every 12 months. However after asking a few other people they all say differently. Ie I don't need to change them that often.'
Firstly what would you recommend and secondly how often do you flush your system.
I use 500ltrs per day
Cheers
Dazzler
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Well I'm not Sean but yes you should be changing your pre-filters on a regular basis to protect the membraine.
In the blue filter housings you should have a sediment filter - these do last a reasonably long time so I'd change it every 12 weeks your carbon filter which is the main protection for your membraine only can handle so many litres before its expired - depending on the make depends on the quality and how long it lasts - I would defo change it every 6 weeks
i have no idea what your clear filter is - do you ?
Darran
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Lee Martin knows purifying water inside out .
His shop is bladeright cleaning
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Chlorine will wreck a reverse osmosis membrane.
It's in the water coming out of every tap in the UK. Its purpose is to kill organisms that would otherwise breed in the water supply and to prevent out breaks of such delightful diseases as cholera. So it's a good thing.
However, it does destroy RO membranes. Slowly but surely. So you need to get it out of the water before it gets to the membrane. To do this you need some kind of carbon filter that absorbs the chlorine. The problem is , that's just what charcoal does, absorb. It doesn't convert it into anything else, just slowly soaks it up. Then a point arrives where the charcoal can take no more and the chlorine in the water passes straight through and starts eating away at the membrane. Your output TDS starts to creep up. If at that point you replace the carbon filter no more damage will be done but equally your membrane won't recover and you'll be using more resin for the rest of your time with that membrane.
So you need to replace a charcoal filter before chlorine starts to get through. Which means sticking to the manufacturer's recommendations - a filter should say how many litres it can take before saturation. However, that's based on a degree of guesswork abut how much chlorine there is in the water coming out of your tap. It's probably pessimistic and can in many circumstances be stretched. However, the cost if you're wrong is a new membrane (for a 4040, the thick end of £250).
So, if you don't want to be measuring water use every day and tracking against the recommended life of the block, what's the solution?
We use a spectrum DI vessel full of acid washed charcoal. It's all from Gaps Water and the vessel and enough charcoal to last about three years will set you back about £75 (vessel) plus £140 (charcoal). Then the running costs will be about £50 worth of charcoal a year. That's based on a similar usage to you.
We do still have a particle filter after the charcoal but mine's picked up nothing at all in two years - it still looks brand new - which suggests the charcoal is also filtering out particles. When I used the old prefilter system they used to end up deep brown (see pic below) but now it's still white after 24 months. I'm going to drop the particle filter on my annual charcoal change in May. The guys all use a 20"x8" Spectrum vessel and an annual change does the job. That's cheaper than the amount you'll spend on 20" filters plus we only have an annual ten minute change to do.
Hope that helps,
Vin
(http://i1359.photobucket.com/albums/q797/Onionman9999/Filter_zpspe3hzyqu.jpg) (http://s1359.photobucket.com/user/Onionman9999/media/Filter_zpspe3hzyqu.jpg.html)
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Well I don't believe it put a post on for seank n he doesn't reply but put a post on about vision and you get more replies from seank than anyone else lol 😀
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Hi Dazzler, your 3 filters will be as follows, first you will have a sediment filter next will be a carbon block and the third
will be a GAC filter or granular activated carbon.
I would only change the sediment filter every 6 months or so, earlier if water production starts to slow, I very rarely change my
carbon filters now as my membrane isn't worth worrying about as its due to be replaced, but when I replace it then I will change
the carbon filter every three months or so even though I know I don't need to, but when you have just forked out £250 you
tend to be more cautious for a while.
Your RO membrane will only need changed when it no longer take the water down to an acceptable level.
I always flush for about 10mins or so before making pure.
Vin you should have waited until that sediment filter dried before taking the picture, I can tell you it will look a lot less
shocking.
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Well I don't believe it put a post on for seank n he doesn't reply but put a post on about vision and you get more replies from seank than anyone else lol 😀
Replied as soon as I got a chance, the Mrs has had me out all day Christmas shopping. :'(
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Oh dear lol ;D
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thanks for all the advice guys, and Sean of course...... ;D