RO system

Well this is the system i ended up buying all up was $300 as i got it off ebay with a bid of $255 with $50 postage to my doorstep, as well as being able to drink it and put it under the sink i hope this will do my aquarium needs. What do you guys think, this do the job??
 
Once my Ro system gets here and i hook it up, is there a time limit to how long you should let the water run though the filters? After that should i immediately do a 20%+ water change on my tank, as it has just de-chlorinated tap water that went through a 2 stage charcoal filter?
 
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