Clean It Up
UK Window Cleaning Forum => Window Cleaning Forum => Topic started by: cybersye on September 04, 2008, 07:44:29 pm
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A 400 ltr tank in van average tds of 350. Ro will be onboard van . I need advice on which ro would be cheapest to maintain, use the least resin and give me a quick fill time with the least waste water.Getting a parking space near my first floor flat is virtually impossible and sometimes I cant even park in same road. I'm soon to be renting driveway space with use of an outside tap but I dont want to be leaving the van there overnight so your suggestions/advice would be very helpful.
Thanks
Simon
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A 400 ltr tank in van average tds of 350. Ro will be onboard van . I need advice on which ro would be cheapest to maintain, use the least resin and give me a quick fill time with the least waste water.Getting a parking space near my first floor flat is virtually impossible and sometimes I cant even park in same road. I'm soon to be renting driveway space with use of an outside tap but I dont want to be leaving the van there overnight so your suggestions/advice would be very helpful.
Thanks
Simon
Then you will be needing a fast RO. Unfortunately, fast does not usually equate to cheap. Presumably you will be wanting that 400 litres filled in maybe 3 hours - 4 top whack. I understand that Merlins produce a lot of waste. I have reduced my Merlin waste with a flow control valve which means higher TDS going into resin. I had to reduce waste for logistical reasons. Also, I question whether a Merlin would be fast enough. My hunch is that you will need a 4040 to fill that quickly. It is possible to have a twin 4040 system for even quicker filling. Not cheap though but less waste than a Merlin and may well fill in the time window that you have.
Can't have it both ways on this one I think. Slow and cheap or faster and more expensive.
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It's got to be a decent 40 inch system for what you need Simon.
www.gapswater.co.uk is your best bet for a fast fill system with the new (ish) high flow ultra low pressure membrane.
I would call June there and tell her your position and you will get very good advice.
Andrew
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Thanks to you both
I think you,ve answered and echoed my thoughts.
I did'nt mention I already have a merlin. I find that it produces quickly but too much waste and still a high product (about 35 - 40 ppm in my case) so when I mentioned cheap to maintain I was more meaning economical (resin) more than purchase price. would anyone know how a 4040 would compare to a merlin, fill time and product tds ? I have looked on gaps site and considered a twin 4040, not cheap I know, but i imagine it would be cheaper to maintain? they soun a lot more straight forward to flush than a merlin so would i be right in thinking the membranes should last a lot longer? how long would you expect a twin 4040 to fill 400lts with 350 tds and a pressure of approx 70 psi ?
Thanks
Simon
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cyber - if I would you I would look @ a 4040 in van, turn the waste down and preboost the water with a booster pump - as Andrew says the HF5 membrane is a good choice or the Desal AK4040TF which is what we use.
With the desal membrane and a booster pump it will take about 2 hrs to fill or if you turn the waste down to about 15% it will take around an hour. Only problem here is the extra workload on the membrane so poss need a softener.
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Thankyou,
just had a look on gaps again the HF5 certainly looks like the one to go for
I feel like I've spent so much money over the last couple of years trying my hardest to set up on a budget but learnt alot too. A false economy maybe but best to test the water (ahem ::) ;D) before taking the plunge.
Anybody else use one of these membranes? whats your verdict?
Thanks
Simon
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simon
I've dealt with June @ gapswater in the past - she's very good and to be honest I would go for whatever she recommends.
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simon
I've dealt with June @ gapswater in the past - she's very good and to be honest I would go for whatever she recommends.
Thanks Alan I shall give her a call.