20th March 2014
This unit is at least 6 years old, it has served me well in its basic form, over the years and mainly due to expansion, I've found a few crinkles I've decided to iron out. In a bid to assist trouble shooting and to help make water production easier and more efficient, the first in a series of upgrades to the RO
unit. In line TDS
meter to monitor water through the various system elements (A common fit on more modern machines). It has already highlighted one problem! Second on the list, an increased capacity DI
stage is planned to improve the service interim time. ((From 250ml to 1400ml) 1650ml if I keep the existing DI
bed in operation).
A split T from the CCB to a tap outlet will provide de-chlorinated water saving me money on one product (lots of money in this house! Can't believe I haven't done this sooner, the filters used is much less money than a de-chlorinator product per annum) Finally some flow meters will be installed to monitor throughput as I think I'm just on/over the limit of the pre filter stage for this unit. (Based on 6 months lifespan over volume throughput capacity) I will definitely be over if I use it as a basic de-chlorinator.
21st March 2014.
After experiencing problems with production water I had to find the cause, my choices were, membrane failure, pre filter failure (CCB past useful life) or DI
resin degradation. I was experiencing problems similar to membrane failure, the inline TDS
meter I recently fitted confirmed this. I thought that was weird as I had just installed a new item in December.
(After all the pipes I unplugged and plugged back in to confirm this the first time around, the new TDS
system fitted sure makes this task much easier, just flick a switch and NO puddles!)
Today, (21st march)
NEW MEMBRANE and CCB/Pre filter stage. New flow restricter.
(After 10 minutes @ 60 PSI (244 TDS
in (Line 1), 003 TDS
Output 000 TDS
Running at 82.8% before membrane/filter change. (See picture Digital Evolution)
Runs at 98.8% That's a clear improvement!
The most likely cause of premature membrane failure, CCB spent.
This CCB has a useful life of 3500 US gallons (13,249 litres) or 6 months! A positive chlorine test confirms CCB expired.
(New membrane and filters dec '13)
Second plausible reason, incorrect installation/flush method on pre filter stage. (Unlikely as it has not happened in the last 5-6 years!)
The second part of the RO
evolution, the flow meter. This will total up the number of litres throughput and should help to ensure this will not happen again. I'm quite sure I used the CCB up in 3 months! If the flow meter saves one membrane it will have paid for itself. It automatically switches on (off) when it detects flow (no flow) so reducing user error. It registers from 0.2 to 5 litres per minute.
in line system has also shown a discrepancy with my handheld meter, I think it's the batteries, still the originals so they've lasted for as long as I've had the RO
unit! It has also revealed incorrect packing of DI
bed once so far! That has proven it is a useful piece of equipment in just one day!
I've also added a couple of ball valves to maintain pressure on the membrane, apparently you're supposed to do this? The first membrane I never did this and it lasted until December 13, maybe it never had time to dry out! I hope membrane 3 lasts as long as the first one did!
(The pictures used show input TDS
at 218 so here it is running at 98.6%)