[Sure Cleaning]

I have new 4040 twin Ro system with booster pump which I bought to replace a 450gpd system.

The tds of the water after pre-filters is around 370, after going through two 4040 membranes the product water is showing a tds in the range of 55 to 70 before going through di filter. At that rate it will cost a fortune in resin. What tds should I expect and how to achieve it?

Currently the waste to product water is 65-35.

Begining to regret buying this, my 450gpd system had a tds of 2 for product water!!   Only benefit so far is the 4040 is very quick at producing water.

Any help of advice would be appreciated.

Steve

[Lee GLS]

Something isn't right. Did you flush the ro first? Have you checked to make sure all the seals a correctly seated inside. My 4040 ro when new produced 8tds from 400

[Sure Cleaning]

Hi Lee,

That's what I thought it should be around 8tds.

I was told it was flushed through before sending out, however, how long did you flush your one through before producing 8tds?

I might also try another tds meter..just in case not right.

Thanks

Steve

[Perfect Windows]

Hi Steve,

Do you have pressure gauges on the filters?  What input pressure are you getting?  Which membranes are you using?

Flushing - took 3-4 hours for my TDS to drop to a normal level but it wasn't too mad before that.

I use a single 4040 with HF5 membrane and 80psi input pressure and I'm 330 or so in, 003-006 out depending on the direction of the wind. 

Let us know the answers above...

Vin

[Sure Cleaning]

Hi Vin,

Thanks for reply.

I do not have pressure gauges on pre filters. input pressure is 80psi from booster pump. axeon membranes (low pressure) are fitted.

I have just changed the tds meter and now getting tds reading of between 8 - 10, what confuses me is the old tds meter is still reading correctly on my tap water..so who knows!!   I am hoping it is the meter..will continue checking.

Thanks Lee & Vin for your help, much appreciated.

Steve

[Perfect Windows]

Ah, the perils of using TDS meters.

Perhaps we should change to multimeters; you'd have to convert ohms to TDS manually.  The extra effort might be outweighed by the fact that any half-decent multimeter is unlikely to drift out of calibration.

Hope it's sorted.

Vin

[heath verrall]

I have new 4040 twin Ro system with booster pump which I bought to replace a 450gpd system.

The tds of the water after pre-filters is around 370, after going through two 4040 membranes the product water is showing a tds in the range of 55 to 70 before going through di filter. At that rate it will cost a fortune in resin. What tds should I expect and how to achieve it?

Currently the waste to product water is 65-35.




Begining to regret buying this, my 450gpd system had a tds of 2 for product water!!   Only benefit so far is the 4040 is very quick at producing water.

Any help of advice would be appreciated.



Steve

Are you sure you have the O ring on the membrane at the outlet side of the ro
 Houseing.

[Sure Cleaning]

Hi ccmids,

Not sure what you mean, but I would have thought it was put together correctly as bought new from ro supplier fully assembled.

Steve

[Ian Lancaster]

If you suspect your TDS meter you can buy calibration fluid at various TDS levels to check and adjust the accuracy.

Unchecked meters make a mockery of the religion of using only '000' water as practised regularly on here.  I've bought quite a few over the years and they were all well out of calibration from new

[Sure Cleaning]

Thanks Ian, Ive ordered some calibration fluid to adjust the accuracy.

You are spot on about unchecked meters, the one I used had been on my 450gpd for two years so who knows if the readings from that were accurate!!!  I also have two hand held meters to check water tds at various times, I will re-calibrate all my meters.

Back to my new 4040, now a lot happier with it, last night filled 700 litres into my tank in a mater of around 3 hours, my old 450gpd ro used to be running almost 24/7 to keep up with my water demands. 

Thanks everyone for your advice, it is appreciated.

Steve

[jk999]

Y did you go for twin ro y not single

[Sure Cleaning]

I went for a twin ro system as firstly it produces more water and secondly it also then produces less waste water than a single.

Steve

[Spruce]

Ah, the perils of using TDS meters.

Perhaps we should change to multimeters; you'd have to convert ohms to TDS manually.  The extra effort might be outweighed by the fact that any half-decent multimeter is unlikely to drift out of calibration.

Hope it's sorted.

Vin

Wow. I didn't know that, although it makes sense when you think about it.

I searched for a fomula online but haven't seen one yet.

[heath verrall]

Hi ccmids,

Not sure what you mean, but I would have thought it was put together correctly as bought new from ro supplier fully assembled.

Steve

im sorry , didnt think they was assembled.

[Matthew Broadhead]

I had the same problem.....try unplugging the inline tds meter pins. Mine had dirt on. Sorted straight away. Do it after you flush though. A good 20mins first time, then 2 or 3 mins every time. Hope that helps