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Yes mate, that would be perfectly Ok...Originally posted by Lionaird View PostWould a Brita Purity C150 Finest filter do the trick instead of a big RO setup?
Just need to make sure you religiously replace the filter every 12 months to ensure adequate protection.
I'm not up with the latest Izzo spec's but if they have s/steel boilers then I would suggest an additional carbon filter to be added in also, to ensure chlorine compounds are reduced as much as possible.
Lyrebird may be able to chirp in with additional information in this regard...
Mal.
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I'm in Brisbane too, Grange area. Currently looking into water filtration because thinking about buying an Izzo Alex Duetto and worried about corrosion.
Would a Brita Purity C150 Finest filter do the trick instead of a big RO setup?
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This is all relevant because I’ve posted an image of my RO which will have remineralisation and an adjustable needle valve to increase TDS and pH to to meet several espresso machine manufacturers minimum recommended TDS (90 ppm for LM; 50 ppm for Victoria Arduino - copper steam boiler can handle lower pH and TDS; and 75 ppm for KVDW) and will cost under $1000.00Originally posted by Lyrebird View PostAnd then:
I am confused what you mean by this, "basic" and low pH are opposites.
Chloride corrosion of stainless is well understood I didn't think that's what we were discussing.
Sure, but again I didn't think that's we were discussing.
Not sure how this is relevant.
Your RO anecdote is interesting but this is Coffee Snobs - this is water for brewing coffee and for high-end prosumer espresso machines. We need RO around Brisbane. The average hardness is almost as high as Adelaide region and TDS is above 250 ppm.
Ideal TDS - for my cup - is RO stripped and calcium/magnesium buffered to 100 ppm.
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And then:Originally posted by sprezzatura View PostIIt’s too basic for stainless steel (corrosion)
I am confused what you mean by this, "basic" and low pH are opposites.Originally posted by sprezzatura View PostWell, there’s a whole lot of stainless steel brew boilers that have been chewed up by chlorine, chlorides and low pH
Chloride corrosion of stainless is well understood I didn't think that's what we were discussing.
Sure, but again I didn't think that's we were discussing.Originally posted by sprezzatura View PostI know, I’m a La Marzocco technician. I know what works for this region and what doesn’t.
If water TDS is too low and boiler probe sensitivity isn’t fine enough you’ll have overfilled boilers. 12 ppm won’t cut it on certain commercial machines.
Not sure how this is relevant.Originally posted by sprezzatura View PostDid your pharma plant RO operate under 7-12 bar of pressure? At 92° - 95°C? And how was your stainless? Some boilers lack enough chromium to resist rust and corrosion.Last edited by Lyrebird; 3 January 2019, 11:34 PM.
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Well, there’s a whole lot of stainless steel brew boilers that have been chewed up by chlorine, chlorides and low pH under pressure and above 85°C - I know, I’m a La Marzocco technician. I know what works for this region and what doesn’t.Originally posted by Lyrebird View PostThat makes no sense to me. Do you have a reference for that?
To make things plain, I have worked in food and bev for over thirty years and have never seen stainless corrosion due to water being too pure.
I once designed a water purification system for a pharma plant that got down to an equivalent TDS of ~0.03 ppm (close to the theoretical minimum* for water) and all the downstream piping was stainless. There were no corrosion problems.
It's such a common furphy that some actual corrosion specialists put it to the test and found no evidence for it.
* Pure water partly dissociates into hydrogen and hydroxyl ions, each at 10^-7 M, which is why neutral water has a pH of 7. Those ions add up to conductivity of 0.055 uS which is equivalent to a TDS of about 0.03 (depending on conversion factor).
If water TDS is too low and boiler probe sensitivity isn’t fine enough you’ll have overfilled boilers. 12 ppm won’t cut it on certain commercial machines.
Did your pharma plant RO operate under 7-12 bar of pressure? At 92° - 95°C? And how was your stainless? Some boilers lack enough chromium to resist rust and corrosion.
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That makes no sense to me. Do you have a reference for that?Originally posted by sprezzatura View PostIt’s too basic for stainless steel (corrosion)
To make things plain, I have worked in food and bev for over thirty years and have never seen stainless corrosion due to water being too pure.
I once designed a water purification system for a pharma plant that got down to an equivalent TDS of ~0.03 ppm (close to the theoretical minimum* for water) and all the downstream piping was stainless. There were no corrosion problems.
It's such a common furphy that some actual corrosion specialists put it to the test and found no evidence for it.
* Pure water partly dissociates into hydrogen and hydroxyl ions, each at 10^-7 M, which is why neutral water has a pH of 7. Those ions add up to conductivity of 0.055 uS which is equivalent to a TDS of about 0.03 (depending on conversion factor).
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It’s silly, isn’t it? My water is stripped to TDS 12 parts per million per litre. It’s too basic for stainless steel (corrosion) and flat for coffee. Great for drinking though. Ok through my Behmor Brazen.Originally posted by Lyrebird View PostWhat's the point of a remineralisation filter?
Are you not just undoing some of what the RO has just done, especially on a coffee system?
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What's the point of a remineralisation filter?
Are you not just undoing some of what the RO has just done, especially on a coffee system?
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Originally posted by sprezzatura View PostI’ll post an image when I install it. I also install and service 3M SGL2 reverse osmosis systems too. They are very good. Site Sponsor Coffee Parts has lots of Everpure systems - RO units; etc.
So, here’s the ROS 270 - I’m waiting for an in-line remineralisation filter.
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I’ll post an image when I install it. I also install and service 3M SGL2 reverse osmosis systems too. They are very good. Site Sponsor Coffee Parts has lots of Everpure systems - RO units; etc.Originally posted by bachamp View PostThanks Sprezzatura, looks like a nice unit.
Does anyone have the Everpure LVRO-75HE RO System? It also looks like a nice and the filters seem to be more common.
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Hi,Originally posted by bachamp View PostHello All,
I thought it's about time I pulled my finger out and got serious with water.
I'm looking to buy an RO Filtration System but not sure what system (or components) would be a good option. I plan to make water in batches. Filter 20L of water and then experiment with adding minerals. The unit will not be used to filter other water around the house, just the water I use for coffee and homebrew.
The system will be connected to mains water.
Location is Brisbane (Morningside) QLD.
What does everyone recommend, and why?
Thanks
Ben
Decent Espresso
I run a Puretec ROS2700 off mains water pressure. It’s a high-output dual Pentair membrane and I have added a needle valve downstream to adjust TDS from the remineralisation filter (calcium and magnesium). This system runs 2 Linea PBs and produces 2.0 litres per minute as tested at full mains (3bar).
I’m buying a Puretec ROS270 (which produces 270ml per minute) for home use (drinking) and my coffee machine. They are simple and very affordable. I’ll probably post mix coffee water like you or install a remineralisation in-line filter.
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I've had a look online for the housing I used but I can't find it, sorry.
It's basically a stainless cylinder with a BSP side port and Victaulic couplings as the end plates. The end plates have the permeate and retentate ports in them. It's on loan at the moment otherwise I'd take a pic and send it to you.Last edited by Lyrebird; 30 November 2018, 03:11 PM.
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Thanks Lyrebird,Originally posted by Lyrebird View PostOK in that situation I would do two things: firstly feed product water back through the system to flush it out before shutting down. Secondly run the system every two weeks or so whether you need the water or not: just use it to water your garden or whatever.
FWIW I built my own RO system: mine was designed to do difficult separations so it's completely over the top for water but the same principles would apply. Get hold of a decent membrane unit (I used a GE Osmonics unit)* a high pressure pump such as a Procon vane pump and plumb it together with Swagelok fittings. Mine has a variable pressure regulating valve on the retentate outlet so I can adjust parameters on the fly, I think you could use a fixed one for water.
*As above the unit I used was designed for adaptability for research purposes so the details aren't relevant here.
I'm quite interested in making my own system, I'll may even have a lot of the components around that I'll need (pumps etc).
Ben
Decent Espresso
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