Zero Water = RO/DI?

Think them zero water filters are just DI filters and well be used up fast depending how hard your tap water is

With RO/DI filters the RO well bring the water down to 3-5 ppm and then the DI side well drop it down to 0 ppm

IF you used a DI filter only and say your tap water was 150 ppm the DI resin would be used up kinda fast and you would have to keep recharging it costing you money

RO/DI filters are water pigs for every 1 Gal. of pure water your using 3-4 Gals to make it depending on water pressure, higher the pressure better the efficiency


have a look at the link to see the filter life

http://ww2.zerowater.com/tds_chart/

http://www.bulkreefsupply.com/store/75-gpd-ro-di-5-stage-plus-system.html this would be my recommendation. Like Jody said those little filters like that don't last and in the end will cost you more then a RODI.

RODI is fine for an APT you don't have to hook it up permanently it can be hooked up to a faucet, or gardenhose/laundry spigot and stored away after making your water.

^ Yep.

Basically a DI filter. They are expected to filter 20-30 gallons before needing replacement. They seem cheap but it adds up fast. In the long run a RO/DI unit would be cheaper. Or buying water from a LFS.

From what I understand of it, that is what a DI unit does. It can effectively purify the water on its own but it will be used up very quickly. The RO part is to clean up the water as much as possible before hitting the DI so that the lifespan is maximized. Effectively it is the more efficient way to do it.

The Zero Water system, say you get 30 gallons out of a cartridge. You divide that by the cost of a replacement cartridge, which appears to be around $15. So $0.50 per gallon of water. And that is assuming you have average water. I'm not sure what a RO/DI unit averages out to be but I'm pretty sure it is much cheaper then that. LFS RO water around here tends to be $0.35 - $0.50.

You get alot of water out of the rodi filters, how often you need to replace really depends on the quality of the water out of your tap. Heres a basic 5 stage filter refill pack for $32 http://www.bulkreefsupply.com/store/5-stage-standard-replacement-filter-kit.html I've made a ton of water before having to change the sediment filter which is just a few dollars by itself. Carbon about once a year. DI Resin even longer. If you have crappy water you may have to do the sediment more often and the carbon after 6 months.

http://www.bulkreefsupply.com/store/75-gpd-ro-di-5-stage-plus-system.html This unit has the kitchen/bathroom faucet adapter, utility sink/garden hose adapter, along with the permanent pipe tap in hardware. They have a unit thats $50 less but I suggest this one as this one includes the dual tds meter, pressure gauge, and flush kit which prolongs your membranes life.

I am at 2 years on my same RO membrane as for the filters they are 30-40 bucks to change, I can go 1 year until i change them not sure how much water i have made but i use RO water in all my tanks and i have 14 of them.