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I use RO water from the machine at walmart, I hope to get a new RO/DI unit and booster pump sometime this year, but this has worked for me for the last 19 months.
I use the same type thing, but it is from my local supermarket. They have an RO unit outside and you just take your own container. I use 5g jugs for water coolers. .30 a gallon so it works well for me right now since I am limited at where to fit an RO/DI unit.
It should say how the water is filtered. It might say something like Reverse osmosis, carbon filtered and maybe even UV filtered. I used this method for a couple of months...paid .25 a gallon. Not bad if your don't mind lugging around water
This may be a silly question, but you always have to ask. Has everyone checked w/ their LFS to see if they offer RO/DI water? I purchase my saltwater and fresh from one that I trust right down the road. Hauling the water sucks, but in an apartment...what else can you do?
Hook your RO unit up to your sink with a faucet attachment. There are many ways to hook up an RO unit with out using a sattle valve that puts a hole into your plumbing.
I have a RO unit, I generate about 10 gals a week.
I hooked up my RO unit by using a diverter aerator on my faucet. No additional plumbing work required. You pull the pin on the aerator to divert the water through a tube into the RO unit.