Hi All.
well mixed bed resin as you know is a mix of Cation and Anion in a 1:1.5 mix
now cation resin is actually a water softener !
how its done
2Na+R– + Ca2+ - Ca2+R–2 + 2Na+
2Na+R– + Mg2+ - Mg2+R–2 + 2Na+
and Anion is the stuff that exchanges the Anions ( cleans the water ish)
yet again how its done
2R+OH– + H2SO4 - R+2SO4 2– + 2H2O
R+OH– + HCl - R+Cl– + H2O
the only difference between the big boys and us is the size of our vessels and according to Dow and after a call to Thermax in India they pretty well confirm some things.
as for filling I like most just put it in and off we go, humm now I know I got it wrong
fill vessel 1/3 full with water ( pure water) and fill with resin slowly ensuring the water is kept above the top of the resin, the free-board should be 5% of the vessels volume. you can do this with or without the dip tube in there, screw it all together and allow to settle
it states it should be back-flushed slowly at this point at a rate of 3 x bed volume, flow rate is dependent on who made the resin.this should be done during the working life of the resin to get rid of the waste the resin collects. this however I feel can be done away with if you are using a RO, the only thing you would benefit from back-flushing then would be to loosen a compacted bed.
True or false? you can rejuvenate mixed bed resin....... True
but I wont go into that due to the fact I dought anyone on here being able to get hold of sulfuric acid let alone hydrochloric acid.
what is classed as pure water? water that contains less than 6PPM of solids is classed as pure this is however only relating to potable water (drinking) and for the purpose that it is used for on here pure should be 0 PPM so that you have a balanced molecule, or I should say near balanced as Dow actually produce resins to take it down to PPB ( parts per billion)
based on this if you have 0ppm its still dirty. "O" stuff it 0 is good enough for me...