[macmac]

I've just put a couple of bags on ebay, it's the cheapest one. Tulison MB 115, top notch.

http://cgi.ebay.co.uk/Mixed-Bed-Resin-For-Window-Cleaning-Systems_W0QQitemZ220169795699QQihZ012QQcategoryZ112579QQssPageNameZWDVWQQrdZ1QQcmdZViewItem

If it did last twice as long I would certainly be interested. In fairness, I have a bag and a half of Dowex resin at the mo so hopefully won't need any just yet. I have found that in our case the Dowex resin has lasted longer than Rohm and Haas for example.

i will keep my eye out for this brand in future though.

Dowex also lasts longer than purolite.

tony

[L.J.Thorpe]

i switched to wfp earlier this year(april) all seemed a bit daunting at first but soon becomes clearer so i am no expert by any means but 600 litres of resin a year seems like a lot surely the cost of an ro cannot compare to that sort of outlay for resin. My tapwater varies alot but is never less than350 and can be more than450 so far have changed filters twice (12 quid or so with vat and postage cleantech) and used 20 litres of resin this allows me to keep tds down to no more than002 but sometimes let it get up to 004 if cant be bothered to change resin dont know about long term probs but so far i have spent more on taps hose fittings and tail connectors than any thing else but that might be my hamfisted treatment of the gear!

[LWC]

i changed my resin in over a year now, have a little 10 " bottle after RO

tds in is around 050

[Paul Coleman]

i switched to wfp earlier this year(april) all seemed a bit daunting at first but soon becomes clearer so i am no expert by any means but 600 litres of resin a year seems like a lot surely the cost of an ro cannot compare to that sort of outlay for resin. My tapwater varies alot but is never less than350 and can be more than450 so far have changed filters twice (12 quid or so with vat and postage cleantech) and used 20 litres of resin this allows me to keep tds down to no more than002 but sometimes let it get up to 004 if cant be bothered to change resin dont know about long term probs but so far i have spent more on taps hose fittings and tail connectors than any thing else but that might be my hamfisted treatment of the gear!

Bear in mind that Dave is based in Cornwall and the water down there is a bit on the soft side

[neil100]

I have used one 25kg bag of resin in  2 years.

I use about 3,000 ltrs of pure water a week.

I have no spare resin at the moment. But my New 4040 memmbrane which I have had for 6 months is giving 0 tds before the resin.

Tap tds is 114 at the moment. i use a booster pump which speeds filling the storage tank up. My RO fills my storage tank with a ltr of pure water every 15 seconds. Approx 4 hrs to fill my tank.

I dont have any hassles with it really.

If I was DI only I would use a 25kg bag a month. Cost to me over 2 years,£1,920.00 and counting.

For me ro made ecnomic sense from day one.Its a lot less hassle then di only as I would be forever changing resin . I have smaller Di vessels in the van which allows me to carry more water. Its faster to fill my 800 ltr tank when I come home from my Ibc tank. 16 mins max for 800ltrs.

So I come home from work and in approx 15 mins My van is all set up for the next days work. I look at how much water I then need to fill my Storage tank and I know when to come back out at night to switch the water and electric off.

Because you fill your van tank so quick with a 1" hose and a pump you will hardly ever flood your van out. If filling from the tap it will take you so long you will do something else and forget your filling your van up, water all over the place yet again.

I am not on a meter so it was very easy for me to decide which way to go. I dont think I will be buying any resin in 2008, maybe in 2009 if my tds starts to climb from my ro.But Iam hoping 2010 will be the next time I buy resin or have to change my DI vessel again.

My first membrane only lasted 18 months. I have learnt the hard way how to look after a membrane. But it stills beat di only by some margin.For money saved, Time saved and Hassle saved. NOt to mention it looks pretty good to own and feels good to own. A bit like having a sense of pride in your van set up,Its a  Fantastic feeling when you open the van doors in a morning and look at your set up. I never got that feeling with my ladders on the roof rack of the car and the bucket of water in the car.

Nel