[clearly pro]

The resin in a di unit can be mixed or used in seporate filters. If you check the polarity of water after your ro unit, the water will have a charge (positive or negative) once you determine the charge,  you will know how much resin to use.  Typically for sake of ease, both resins are equal in a di unit...equal parts of both resins are NOT  needed. Only about half of one of the resins usually being used will suffice. In other words, if you are using equal amounts of both resins, you are wasting one of the resins. Here in the US any decent water company can help cosrt out the ratio by a simple water polarity test. That, in and of itself, will reduce your resin cost by at least 25 %. Also, if you are using a mixed bed (single filter full of resin) you cna purchase another filter for resin and seporate the resins resulting in a longer resin life.
However, if your unit sets for several days at the time, the resin will loose its filtering life. Always run a gallon or two a day through your unit to extend the life of resins.

[ian davison]

I regenerate my own resin using caustic and acid pulled into two vessals where its charged.
It takes about an hour.Then the resin can last upto 6000 lts untill needing to be regenerated again.
No more costly resin!
      Ewen 

[Davindo Cleana]

This is getting like Maths and Chemistry and it's Saturday!

Clearly Pro It is interesting but to be honest, if you have a decent ro pulling the TDS right down, then the resin lasts a long time - 25% of resin might be $35 or £20 (rough average exchange rate) spread over the life, which could be many months
Might be worth it for those just using di and no ro

Ewan, is there much danger in the regeneration and does it cost much

[ian davison]

No danger as long as you store chemicals safely.
As for cost not really sure as the chap i bought the system off gave me 10 years supply of chemicals.
I only use uncharged resin which i need to change once every 2 years.
        Ewen

[ian davison]

The best benifit of this system is that i dont throw half the water down the drain like with an r.o.
I can also fast fill on site.
           Ewen

[Davindo Cleana]

Are you on low TDS Ewan

[ian davison]

No its quite high here.

[Davindo Cleana]

So you don't use an ro and don't have to change the resin - just regenerate.
If so that could be a blinder when you consider what most other people are doing to achieve alchemy

[ian davison]

Its an amazing machine.
I bought it second hand of a chap in leeds yesterday.
He used it for his tropical fish.

[clearly pro]

I see your point. I am used to having to pay around $120 (US) a month for tank rental. I would rather have a unit that regenerates like the one mentioned above but I would need a hazardous material zone to use it in. Funny how your health laws affect your ladders but you can store caustics and acids. We on the other hand can climb old rickity ladders drunk with one arm tied to a tree while wearing a blindfold but cannot store acids and caustics around the home. They would rather me fall and break my head off before they will let me kill the grass. 

I do not have as of yet an RO unit in front of my di unit so there is NO watse water. However, the DI alone is costing me well over 1000 bucks a year.  Plus, using my system when I am out of water in my tank I have to stop and go home to refil.

[Davindo Cleana]

How ironic that your govt would not sign up to the Kyoto (sp?) Treaty on toxic waste and they don't let you keep hazardous chems - hilarious
You will be a changed man (or woman) when you get your ro

[clearly pro]

Ewen,
you might be interested to konw (if you do not aready) that DI water is an excellent rust remover over time. The water is more on the acid side after it has been purified through the di process.  Just for crapps and giggles you can drop an old rusty nail in a five gallon of di water and in a few days, the rust is gone. DI water also has a very agressive cleaning base. Thats is to say it not only dries spot free. it also helps to break down the properties that caus spotting and scaling. If you use it around the house for cleaning you will notice it actually cleans better.

Okay, I will stop advocating di water now as I am sure you are all well aware of all of this. I abviously had some free time this morning.

[ian davison]

I wont tell the missis that she'l have me doing the cleaning!
Interesting stuff about the rust though.
                   Ewen

[Davindo Cleana]

Clearly - if you have cable, see if you can watch the England 'soccer' game in a couple of hours - we will all be chewing our nails
Interesting post mate and now you have given us a new phrase "just for craps and giggles"

[ian davison]

Yeh so just for craps and giggles watch the england game.
Probally more crap than giggles though!

[ian davison]

Just out of interest whats the best way to store resin?
             Ewen

[Paul Coleman]

The resin in a di unit can be mixed or used in seporate filters. If you check the polarity of water after your ro unit, the water will have a charge (positive or negative) once you determine the charge,  you will know how much resin to use.  Typically for sake of ease, both resins are equal in a di unit...equal parts of both resins are NOT  needed. Only about half of one of the resins usually being used will suffice. In other words, if you are using equal amounts of both resins, you are wasting one of the resins. Here in the US any decent water company can help cosrt out the ratio by a simple water polarity test. That, in and of itself, will reduce your resin cost by at least 25 %. Also, if you are using a mixed bed (single filter full of resin) you cna purchase another filter for resin and seporate the resins resulting in a longer resin life.
However, if your unit sets for several days at the time, the resin will loose its filtering life. Always run a gallon or two a day through your unit to extend the life of resins.

Can you believe that one of the things that originally attracted me to window cleaning was its simplicity?