Tap tds, pressure, pre di tds and waste/pure survey

[ks789]

ok, sorry about the bold txt, tried to make the title bold but anyway. short survey, as in the title, here goes

Tap tds  -  530

Pressure before Ro   -  50

Pre Di tds   -  12

Waste/pure ratio   -  3/1

( oh yes, and 40/21 ro )

much appreciation for contributors

cheers

kev.  :1f44d:

 

[Part Timer]

Tap TDS 320

Boosted pressure 100

Pre DI 8

Waste / Pure 50/50

4040

 

[DJT]

How do you work our your waste to pure ratio? 

 

[ks789]

How do you work our your waste to pure ratio? 

I do mine by timing how long it takes to fill a pint or half of waste and do the same with pure. Its not totally precise that way but i fill this glass up with waste in 8 seconds and the same glass with pure takes about 22/23 seconds so that makes it 3 to 1 or put it another way 75 to 25

 

[RWCleaning]

Tap- 245ppm 

booster pump pressure-75psi (20 without)

if new membranes, pre filters & a good flush, pre d.i 7ppm. But think it was 12 when I last checked.

ratio waste to pure- about 20% pure without booster pump, 40% pure with booster pump. 

 

[doug atkinson]

ok, sorry about the bold txt, tried to make the title bold but anyway. short survey, as in the title, here goes

Tap tds  -  530

Pressure before Ro   -  50

Pre Di tds   -  12

Waste/pure ratio   -  3/1

( oh yes, and 40/21 ro )

much appreciation for contributors

cheers

kev.  :1f44d:

Wow 530. That can be deemed unsafe to drink. With such high ppm you may find your membranes do not last that long

 

[ks789]

Wow 530. That can be deemed unsafe to drink. With such high ppm you may find your membranes do not last that long

yeh its a pain, wish they'd sort it out but I think its the calcerous aquifers underground that cause it. Some say water softener would help a bit but others reckon its as broad as its long as cost of that could just get new membranes instead. I think Ive read that some in east anglia only get several years from their membranes. As I only use a relatively small amount im hoping to get longer than that.

 

[trevor peacock]

tap - 330

pressure - 80 with booster pump

pre di tds - 8 depending on age of membrane

waste/pure - 2/1

with 450 gpd ro system.

I change the membrane once a year when the pre di gets to 25 - 30

 

[marc674]

Tap tds 170
Mains pressure 60psi
Pure before di 4/5
Waste/pure 50/50
4021 ro

Sent using the Window Cleaning Forums mobile app

 

[Guest]

Surely you should look at how many litres a membrane uses, rather than how many months or years it lasts? Ours had done 9 months and is done in but has made gazillions of pure.

 

[spruce]

Surely you should look at how many litres a membrane uses, rather than how many months or years it lasts? Ours had done 9 months and is done in but has made gazillions of pure.

IMHO a survey such as this doesn't really help much as membrane life is also connected to prefilter maintenance, membrane flushing, water quality, water pressure, water composition as well as the amount of water the membrane produces. If you live in an area where the water has a high calcium content then that membrane is going to suffer with calcification.

Those on a water meter might restrict the waste to save money on their water bill. So whilst the membrane/s doesn't last as long, the cost of a premature replacement membrane and extra resin useage is compensated by the reduced cost of water.

 

[ks789]

Surely you should look at how many litres a membrane uses, rather than how many months or years it lasts? Ours had done 9 months and is done in but has made gazillions of pure.

I am looking at how many litres it does. I only use about 200 or so litres a week so you would expect a nice longish life for them. when they pack in I will know. Obviously its handy to know these things.

 

[ks789]

I was curious as to how my set up fared compared to others. I cant really restrict the waste on mine, much as Id like to, because although it increases the pressure it also increases the tds. To get 12 before di its about 50 pressure and 3 waste to 1 pure. this is ok as im a small producer presently. Even when I increase my work, I shouldnt think too much about the water bill, as if it costs £3 to produce 400 litres for example, thats no problem as that amount can earn £400. Still, wouldnt wanna buy a new axeon every year.

 

[Guest]

I was curious as to how my set up fared compared to others. I cant really restrict the waste on mine, much as Id like to, because although it increases the pressure it also increases the tds. To get 12 before di its about 50 pressure and 3 waste to 1 pure. this is ok as im a small producer presently. Even when I increase my work, I shouldnt think too much about the water bill, as if it costs £3 to produce 400 litres for example, thats no problem as that amount can earn £400. Still, wouldnt wanna buy a new axeon every year.

You need a booster pump amigo.

Although, they can be noisy.

 

[ks789]

yes mate, I reckon would be worthwhile. fair price but probably last on and on. certainly a good weapon in the window cleaners arsenal.

 

[GGCleaningServices]

Tap tds: 380/400
Mains Pressure: 52psi

Before DI: 10/11
Waste/pure 60/40
4040 HF5