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Thanks!,
-- Rick Walker------- Forwarded Message
Return-Path: cp@everest.hpl.hp.com Received: from cphelan.hpl.hp.com by cutter.hpl.hp.com with SMTP (1.37.109.8/15.5+ECS 3.3+HPL1.1) id AA08314; Wed, 28 Jun 1995 00:09:35 -0700 Return-Path: <cp@everest.hpl.hp.com> Received: by everest.hpl.hp.com (1.37.109.16/15.6+ISC) id AA003263362; Wed, 28 Jun 1995 08:09:22 +0100 Message-Id: <199506280709.AA003263362@everest.hpl.hp.com> To: walker@cutter.hpl.hp.com Mailer: Elm [revision: 70.85]
One of yours I believe!
Carolyn
> > > Richard Marsden writes: > > <ion-exchange resins> ... > > There are two varieties. One will swap cations for H+, the other > > will swap anions for OH-. > ... > > Using both resins, should remove both anions & cations, with the H & > > OH combining to produce H2O. > > > > The beads we used were orange. I don't know where you get them > > from. I doubt they'll remove many organics. > > > I should think calcium and chlorine are probably the most > damaging components of regular tapwater... I guess the carbon > helps with some chemicals the resin can't deal with. > > > > If I remember correctly, they could be "recharged" by running strong > > acid or alkali (respectively) through the beads. > > > Do you (or anyone,) know if it's safe to clean with both acid > and alkali if both types are mixed? I wouldn't want to damage > the acid tolerant ones with alkali or vice versa. I think I'll > probably give it a go, but I'll test it on some spare capensis > etc. first to see if it does the job. Presumably I need to > rinse it out pretty well to clean out any caustic residue... > > > and Wim Osterholt writes: > > > That sounds quite right. 25 years ago I was in a laboratory that > > used stuff like that. One cylinder H+ swappers and the other one > > OH- swappers. Was regenerated by rinsing with HCl and NaOH. > > Colours dark brown and light brown. > > > Presumably H2SO4 will work as well as HCl - I can't get HCl > easily, but I'm hoping battery acid will do. Caustic soda is > cheaply available for cleaning drains etc. > > > > I could probably rig something like this up. The problem with > > electronic pH meters, is the cost of the probes (which I think are > > also quite delicate). > > > I got one from Texas (superstore, not the state :) for 6 quid - > not remarkably accurate, but adequate. Or there's always the > chemical testers. > > > > Remember that you all (probably) already have a H2O generator at > > home. Take a matchbox or some such to prevent your fridge door to > > fully close. Defrost it every day and collect the melting condensed > > ice from it into a suitable device. > > > Umm, I think that could work out even more expensive than > cartridges when the electricity bill arrives :) > > > I'll post my results to the list when I've had a play with this > stuff (if only a warning about crispy capensises (capenses?) > > > Happy growing, > > > Peter > > > >
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