[DAVID WARD]

Hi
does anyone run a RO without  DI, i was adviced that i should not need a DI as we have soft water our TDS reading is 76. just ordered a HF4-4040.....what TDS would you expect to come out after RO.

thanks dave

[D B Services]

It should be in single figures.

We will use water at up to 5 PPM but like to use 000.  I would still use a DI. You will hardly use any resin at all but it is there just in case your RO reading out spikes for any reason. 

Dan

[daz1977]

i have a tds of 75 and i use a di only and i have no problems

[DAVID WARD]

thanks for the reply's ..............think i will get it up and running and see what happens but if anyone just runs a RO without DI i would like to hear from you......
thanks dave

[dd]

I have used RO only for about 3 years. Never had it go above 007.

Current RO produces water at 003-004 consistently for over a year so do not see the point of spending on resin.

[SherwoodCleaningSe]

Just a thought, tds readings change depending on the temperature of the water.  So a reading of 5 in the winter will be more like 20 in the summer.  My resin had been spent a while back and I didn't bother changing it, the reading was only 2, if I heated the water it would jump to about 15, I didn't get any spotting whatsoever. 

However changed my resin so that the reading is now 0 and also 0 when the water is heated, still no spotting but the cleaning power is so much better.  You may be able to clean at 2, 5 or 20 ppm with out spotting but 000ppm will always give much better cleaning power meaning getting rid of stubborn marks much faster and easier.

Simon.

[prestigeclean]

i,ve been using the pure freedom 450gpd ro without di for about nine months and the water comes out at 001 but i do back flush very regularly , my tds is 180 regards alan

[Window Washers]

i have a tds of 75 and i use a di only and i have no problems

you should get an ro, as you will be spending on resin more than you need to, ask dave morris, he used to use di only.
ro can get below 10tds so well worth having 

[niceandclean]

I have a HF5, had it since October. Tds 340-360, after pre filters and ro is 14-15 thats at 40psi on tap pressure. I use a booster pump which takes the pressure up to 75-80 psi and after pre filters and ro tds is 006.

I also have an ro man 4040 system, but at the unit. Tds in is 320-350 after pre filters and ro at 30-35 psi 018. With booster pump at 65-70psi it comes out at 012.

With a low tds and the new HF5, you should be fine without di.

[dd]

Just a thought, tds readings change depending on the temperature of the water.  So a reading of 5 in the winter will be more like 20 in the summer.  My resin had been spent a while back and I didn't bother changing it, the reading was only 2, if I heated the water it would jump to about 15, I didn't get any spotting whatsoever. 

However changed my resin so that the reading is now 0 and also 0 when the water is heated, still no spotting but the cleaning power is so much better.  You may be able to clean at 2, 5 or 20 ppm with out spotting but 000ppm will always give much better cleaning power meaning getting rid of stubborn marks much faster and easier.

Simon.

My tds from the ro is the same all year round.

[SherwoodCleaningSe]

Try bringing your ro water up to room temperature though or even higher and you'll see the tds rise.  It's not really going up the tds has to remain the same but what reading is correct, at what temperature should you measure tds.

Simon.

[DAVID WARD]

Well just put the RO in had a couple of leaks here and there but ptfe tape  works wonders, not messed about to much with it but got the TDS down to 3 but will have another go tomorrow (oh  how i hate to waste all that water) Well chuffed getting the tank installed tues so should be running later this week.

dave

[niceandclean]

Well just put the RO in had a couple of leaks here and there but ptfe tape  works wonders, not messed about to much with it but got the TDS down to 3 but will have another go tomorrow (ho how i hate to waste all that water) Well chuffed getting the tank installed tues so should be running later this week.

dave

Whats the water pressure?

[DAVID WARD]

Hi
Not sure what the pressure was

[niceandclean]

Hi
Not sure what the pressure was

If you have got it down to 003 on tap pressure, if you get a booster pump that should get you down to 000, or just di after ro, your resin will last for ages. But to be honest, i wouldnt bother and just use 003 to clean, but thats me. 

[DAVID WARD]

well checked the water pressure and its 55psi, do you think its worth gettin a booster   tds is 3

[Ian Lancaster]

No

[Window Washers]

well checked the water pressure and its 55psi, do you think its worth gettin a booster   tds is 3

would make your water quicker, but would make very little difference to your end result, only you know if your time making it to time saved would be worth it.

So the answer would be whats your time worth ?

[niceandclean]

Id say no as well. As for time ect, i would get a shut off valve, or put an over flow on your tank just in case.

[barry mallett]

if your tds is so low why bother pratting about with an ro just get a di less hassle instant water