Clean It Up
UK Window Cleaning Forum => Window Cleaning Forum => Topic started by: NWH on August 20, 2007, 08:01:55 pm
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What`s the difference in waste,i`ve heard people say that the waste from the 40x40 is far less than the merlin,i`ve also heard others say that waste from the merlin is the same as the 40x40.Does anyone have the facts on waste as far as these 2 RO`s are concerned,you hear lots of different stories.I`ve read the info on both but does anyone have experience first hand.Cheers.
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Ok, without all the technical spec from experience:
I have used a 4040 for 2 years
Mains pressure for 1st year 25psi
TDS in = 390. TDS out 18
After 1 year like that poor 4040 is being tested!
I added a booster pump:
Mains pressure for 2nd year average 60psi
TDS in = 390. TDS out has recently dropped to 50.
Time to change membrane....ouch!
What you want to know is waste/conversion?
I use an inline TDS meter to get optimum exchange.
An average was/is about 75% waste to 25% Pure
That converts to about 200-250litres per hour Pure
But I have used up my membrane in 2 years.
Any questions?
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I have a 4040 going for 8 months now. I have a booster pump and also recycle a percentage of the waste.
Inlet is 400ppm Outlet is 3ppm or lower. For every 1 liter pure I waste about .75 of a liter. I can fill my 1000L tank in 5 hours.
Pj why don't you invest in a water softener to make the membrane last longer.
Simon.
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Thing is you here people say that a 40x40 only rejects 25% and the rest goes in the tank,i think not more like the other way round.
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You CAN run a 4040 at 20% waste but you will ruin it quickly.
In anything like hard water areas a softener is almost a must as well. You should nicely be able to run a 4040 at 1 to 1 waste to pure in a medium water area or a hard water one with a softener first. Regular flushing helps as well.
Te Merlin is in my opinion really only good in soft to medium water areas but the waste is gonna be at least 3 to 1. More like 5 to 1. In hard water areas you really need a softener again.
Given the choice I would go for a 40 inch set up any day.
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I have a 4040 going for 8 months now. I have a booster pump and also recycle a percentage of the waste.
Inlet is 400ppm Outlet is 3ppm or lower. For every 1 liter pure I waste about .75 of a liter. I can fill my 1000L tank in 5 hours.
Pj why don't you invest in a water softener to make the membrane last longer.
Simon.
Yes, a water softener might make a difference with a new membrane. I just have to decide if that is the way I want to go.
New membrane approx £230. Water softener approx £250.
£500 hmmm!
Nice soft towels and underwear?