Insane in the membrane

[C Rose Cleaning Services]

(yes I did it)

How on earth do you know when your membrane is spent? Not that mine should be in any danger for some time cos it's only 3 months old, but I just wondered how you test for it failing?

 

[spruce]

By recording tap water tds and pure water tds after r/o and before di vessel.

A good membrane will be removing about 98% of all impurities in the water. Once it only removes 94% of impurities is the time to replace it according to most experts.

However, it all about balancing the cost of the membrane against the extra cost of resin.

Those who had a new Merlin in days gone by found that new a Merlin would only remove 90% of the impurities out of the box. (Impurities as far as window cleaning is concerned.)

 

[C Rose Cleaning Services]

By recording tap water tds and pure water tds after r/o and before di vessel.
A good membrane will be removing about 98% of all impurities in the water. Once it only removes 94% of impurities is the time to replace it according to most experts.

However, it all about balancing the cost of the membrane against the extra cost of resin.

Those who had a new Merlin in days gone by found that new a Merlin would only remove 90% of the impurities out of the box. (Impurities as far as window cleaning is concerned.)

OK cool. My tap water TDS is 360 give or take so the membrane should be bringing that down to about 8ppm then at full life?

 

[Tuffers]

OK cool. My tap water TDS is 360 give or take so the membrane should be bringing that down to about 8ppm then at full life?

Interesting thread. My tap TDS is about 200. I've got a 40" membrane that's only 4 months old and my inline TDS meter is telling me water is coming out the RO at 014. My hand held TDS meter says it's coming out at 006 . I produce about 300L of pure a day.

 

[C Rose Cleaning Services]

Interesting thread. My tap TDS is about 200. I've got a 40" membrane that's only 4 months old and my inline TDS meter is telling me water is coming out the RO at 014. My hand held TDS meter says it's coming out at 006 . I produce about 300L of pure a day.

I'm just going on Spruce's math. As long as my end product is 0ppm that's all I'm concerned with atm. I change my sediment and carbon blocks monthly and haven't had to change my resin as of yet, but I've got 25L in the cupboard. I'm just curious cos I've bought all the gear but trying to get up to speed with how everything works, when it needs servicing and so on.

My next thread is going to be the battery life on a leisure battery and it's drain on my main van battery using a split relay hahahah... But I'll save that for another day.

 

[Solarpanelcleanington]

Insane in the brain!

 

[steve garwood]

By the way c. Rose, that's one of the best titles I've seen on here :thumbsup:

 

[steve garwood]

I'm just going on Spruce's math. As long as my end product is 0ppm that's all I'm concerned with atm. I change my sediment and carbon blocks monthly and haven't had to change my resin as of yet, but I've got 25L in the cupboard. I'm just curious cos I've bought all the gear but trying to get up to speed with how everything works, when it needs servicing and so on.
My next thread is going to be the battery life on a leisure battery and it's drain on my main van battery using a split relay hahahah... But I'll save that for another day.

Changing your pre filters monthly seems a bit excessive mate. 3 monthly is about average /emoticons/smile.png

 

[C Rose Cleaning Services]

Changing your pre filters monthly seems a bit excessive mate. 3 monthly is about average /emoticons/smile.png

Oh really? Even with such a high TDS? WCW told me monthly when I bought it. Interesting.

 

[Dave B]

It's all to do with the amount of water that passes through a pre filter (product and waste combined as it all goes through the filters first)

I can't remember off hand but i am sure @spruce will know

The more water you produce the more often you need to change pre filters

 

[AGlassAct]

Pre filters do nothing for the TDS, they remove sediment and chlorine which protects your membrane. Stick a water meter inline so you can record when your filters are due - the gardiner fibredyne suggest 70 odd thousand litres and can also be used as a sediment filter, I still recommend a separate pre filter as the mains water is dirtier than you think !

Sent using the Window Cleaning Forums mobile app

 

[Dave B]

I'm lucky my water doesn't dirty my sediment filter even after 3 months it is still clean and white

Fibredyne is what i am going for when my stock of old ones run out

 

[spruce]

By membrane I thought you were meaning the r/o membrane as that's the only membrane in our system.

If you are talking about prefilters then that's a different story. I have clear filter bowls as well as water pressure gauges on both sides of the prefilters.

I use a 20" sediment and 20" fiberdyne carbon block from Gardiners. I can see visually when my sediment filter is getting dirty. I also look at the pressure gauges. When the difference between both of them is 10 psi then its time to change the sediment filter.

I have a water meter on my r/o and change the Fiberdyne c/b filter once 78,000 liters of water goes through my r/o. That's what the manufacturers advise and that works for me.

At the moment our water is quite clean so the last year I've been able to change both filters at the same time. The year previously I was changing the sediment filter once a month and the c/b filter once every 3 months.

.

 

[spruce]

Changing your pre filters monthly seems a bit excessive mate. 3 monthly is about average /emoticons/smile.png

That could of course depend on what the manufacturers of the c/b filter say the service life is.

I have a 20" GAC filter under my desk that has a service life of 2500 US gallons - 10000 liters. We are currently using 10000 liters of pure a month. Our r/o is set at about 50% waste to 50% pure. So I would have to change that GAC filter every 2 weeks if I was using it.

 

[spruce]

I'm just going on Spruce's math. As long as my end product is 0ppm that's all I'm concerned with atm. I change my sediment and carbon blocks monthly and haven't had to change my resin as of yet, but I've got 25L in the cupboard. I'm just curious cos I've bought all the gear but trying to get up to speed with how everything works, when it needs servicing and so on.
My next thread is going to be the battery life on a leisure battery and it's drain on my main van battery using a split relay hahahah... But I'll save that for another day.

Your di vessel will just be removing or polishing off those remaining ppm the r/o membrane missed. So irf everything is working well then the resin won't be doing much work - not like it did when you were di only.

Once you get your head around it with time, its not complicated - honestly.

 

[steve garwood]

That could of course depend on what the manufacturers of the c/b filter say the service life is.
I have a 20" GAC filter under my desk that has a service life of 2500 US gallons - 10000 liters. We are currently using 10000 liters of pure a month. Our r/o is set at about 50% waste to 50% pure. So I would have to change that GAC filter every 2 weeks if I was using it.

Maybe I should of worded that thread better. What I meant was, changing my pre filters every 3 months is an average for me /emoticons/smile.png

 

[C Rose Cleaning Services]

No @spruce I was referring to my membrane. I think you've helped with the math of pre filtration before anyway and we'd worked mine out to monthly. For 8 quid I'm happy doing that to protect the membrane regardless.

 

[C Rose Cleaning Services]

I'm lucky my water doesn't dirty my sediment filter even after 3 months it is still clean and whiteFibredyne is what i am going for when my stock of old ones run out

My sediment is always a yellow brown after four weeks.

 

[spruce]

Maybe I should of worded that thread better. What I meant was, changing my pre filters every 3 months is an average for me /emoticons/smile.png

I think most suppliers use that 3 month replacement as a guide. Some replace their prefilters every 6 months and still have acceptable membrane longevity.

How do the manufacturers of Fiberdyne filters know that its good for 78,000 liters (slightly less actually) when they have no idea how much chlorine is in our water at any given time?

I don't know the answer to that. @doug atkinson once posted that concentrations of chlorine in the water reduce the further away we are from the dosing point. Where is our dosing point?

I can only presume that the manufactures will use a maximum dosage of chlorine permissible without endangering our health to based those calculations on.

If the chlorine in our water at home is much less than what their calculations are based on, my logic would tell me that my c/b will last longer than 78,000 liters.

My 4040 is 4 years old and my membrane is still working to spec. So the Fiberdyne quoted figures are working for me. Maybe I'm replacing those c/b prefilters prematurely, I don't know. All I have to go on is the manufacturers' guide. Their guide is working for me so I will stick to following it.

.

 

[spruce]

My sediment is always a yellow brown after four weeks.

There we times when I was horrified at the slim and sludge on the sediment filter when I took it out. I had even considered fitting a filter on the pipe to our kitchen tap as I couldn't believe what we were drinking.

 

[C Rose Cleaning Services]

There we times when I was horrified at the slim and sludge on the sediment filter when I took it out. I had even considered fitting a filter on the pipe to our kitchen tap as I couldn't believe what we were drinking.

Yeah pretty shitty isn't it. If I'm on a flush month I always buy bottled now hahah