Clean It Up
UK Window Cleaning Forum => Window Cleaning Forum => Topic started by: Fin Clearview on May 27, 2014, 09:41:18 pm
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Ok it seems I did the easy bit in deciding to upgrade my piddly Ro to either a 4040 or a 4021...I spoke to em all today gaps, daqua, vyair and PF. What an absolute brainache! It seems no one sells one machine that fits all, their all down to different compromises as many of you clever bods know. It's either less tds vs higher production blahdy blahdy blah, it's a good job I had a beer in the fridge when I got home crikey :-\
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Ok it seems I did the easy bit in deciding to upgrade my piddly Ro to either a 4040 or a 4021...I spoke to em all today gaps, daqua, vyair and PF. What an absolute brainache! It seems no one sells one machine that fits all, their all down to different compromises as many of you clever bods know. It's either less tds vs higher production blahdy blahdy blah, it's a good job I had a beer in the fridge when I got home crikey :-\
When we started off we had a RoMan type r/o which already had a restrictor in the waste line. It was easy to setup as the restrictor allowed 3 litres of waste to each litre of pure. We had no control over that setup as it was.
There was the possibility of buying a 5 to 1 restrictor which they sold for users who had high tap water tds. I didn't take long for those 5:1 restrictor to disappear off their website.
7 years later and we now have a 4040 r/o with a waste gate valve ( brass gate valve in our case) to adjust the waste to suit. In our case I drilled a 1mm hole through the valve gate so it would not be possible to completely shut it.
I fitted an inline tds meter and found that on our water pressure, the HF5 membrane was performing best at about a 50:50 ratio waste to pure. It is easy to adjust while watching the tds meter.
Our tap tds varies from 90 (occassionally) to 115 ppm (usually) so we can get away with a 'tighter' ratio. If you have a very high tap water tds then you need to have a higher waste to pure ratio to help prolong the life of the membrane/s.
But if you are on a water meter, then you need to balance the cost of waste against the cost of a replacement membrane. With water costs you might find it more cost effective to still reduce the waste to pure ratio and replace the membrane a little more often.
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Sounds like to much hassle Spruce.
Think ill stick to me 450 gpd with booster 👍
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Ok it seems I did the easy bit in deciding to upgrade my piddly Ro to either a 4040 or a 4021...I spoke to em all today gaps, daqua, vyair and PF. What an absolute brainache! It seems no one sells one machine that fits all, their all down to different compromises as many of you clever bods know. It's either less tds vs higher production blahdy blahdy blah, it's a good job I had a beer in the fridge when I got home crikey :-\
When we started off we had a RoMan type r/o which already had a restrictor in the waste line. It was easy to setup as the restrictor allowed 3 litres of waste to each litre of pure. We had no control over that setup as it was.
There was the possibility of buying a 5 to 1 restrictor which they sold for users who had high tap water tds. I didn't take long for those 5:1 restrictor to disappear off their website.
7 years later and we now have a 4040 r/o with a waste gate valve ( brass gate valve in our case) to adjust the waste to suit. In our case I drilled a 1mm hole through the valve gate so it would not be possible to completely shut it.
I fitted an inline tds meter and found that on our water pressure, the HF5 membrane was performing best at about a 50:50 ratio waste to pure. It is easy to adjust while watching the tds meter.
Our tap tds varies from 90 (occassionally) to 115 ppm (usually) so we can get away with a 'tighter' ratio. If you have a very high tap water tds then you need to have a higher waste to pure ratio to help prolong the life of the membrane/s.
But if you are on a water meter, then you need to balance the cost of waste against the cost of a replacement membrane. With water costs you might find it more cost effective to still reduce the waste to pure ratio and replace the membrane a little more often.
Cheers Spruce, I agree with Danny it all becomes so complicated. Measuring waste vs replacement membranes - impossible isn't it? I am on a meter though and think I'll just aim for lowest tds/resin replacement over waste/replacement membrane.. And hope for the best.
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I'm on a meter, so I stick with my 200GPD unit, as it doesn't waste much water, and just about keeps up if left running most of the time.