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Exactly why I asked condor, I bought 20g's of RODI from a LFS a few months ago and got home and stuck my TDS meter in and it read at over 70 so I went and got my own RODI unit;) LFS's have a ton of things going on and unfortunately them changing out filters on their water purifiers is not at the top of their list of things to get done:(also you should invest in a RO unit so you can personally monitor the tds. you never know if they a slacking off on changing the cartridges and membrane when needed
another prob imo . what is your dkh and ca levelok ill try to look into one.....does ph have anything to do with algae growth or is that just a whole other problem?:neutral: