RO/DI Filter ... Good deal...I think

[Derpeder]

I have an opportunity to purchase a used RO unit for $35. Now the unit is just over 2 years old and the gentleman used it for only 1 of those two years. Is this going to be a good buy. I don't know how long these things last or how good they are when they are older. Can I change the filters in them for cheap?

Unfortunately I don't know the type but the guy said he bought it for over $200 two years ago.

Any advice would help.

 

[fatsolomon]

yea, its a pretty good deal but i would change the cartridges. itll still end up being a decect deal.

 

[Derpeder]

yea, its a pretty good deal but i would change the cartridges. itll still end up being a decect deal.

Cool.....Do you know how long these units normally last?

 

[Crazy8svt]

Cool.....Do you know how long these units normally last?

it will work for ever just keep it clean and change the filters when needed. some filters change there appearance when they need to be changed. I'd recommend getting a DI stage for it.

when you change the filters the first 20 gal. shouldn't be used for your aquarium just dump it out. I also reverse my lines once a month to flush it out.

 

[sQwiReL]

heard britta... that one water purifier jug thing is pretty much r/o water. so if you dont have a huge tank.... one of those things would be good

 

[kay-bee]

RO membranes typically require replacement every 3 years, give or take.

Sediment and carbon prefilters should be replaced about every 6 months. Were you to get the DI, DI resin replacement about every 3-6 months (depending on source water total dissolved solids (TDS) levels and efficiency of the prefilters and RO membrane).

A TDS meter will indicate how efficient your RO membrane is (measure the TDS levels of your source water and then the TDS levels of the RO water). Typically the membrane should be removing 96-98% of the TDS from the source water (though probably anything above 90% is acceptable). DI would reduce the remaining RO to 0-1ppm.

heard britta... that one water purifier jug thing is pretty much r/o water. so if you dont have a huge tank.... one of those things would be good

Brita drinking water filters jugs essentially provided filtered water of a sort but do not provide RO quality water. My tap water has a TDS level of about 255ppm. My Brita drinking water filter (which has been in use for about a week) reduces TDS to 172ppm (removing only about 67% of the TDS). The RO unit I have, however, produces 8ppm TDS after the RO (and reduced to 0ppm after the DI).