RO/DI HOW MUCH PER DAY

[WBJ]

I'm looking to purchase a RO/DI system and have an output question. Between water top off and changes, I use about 30 gallons per month, and I buy RO water for .20 per gallon. What do I gain with DI, and why do all the sites say I need an output of 75 gallons per day? Your help in solving my confusion is greatly appreciated!

 

[Mike1970]

75 gallons per day is how much RODI water that particular unit can supply in 1 day

 

[KrisReef]

75 gpd isn’t a magic number but it does have a lot of standard size features that make purchasing replacement cartridges easier since they are standard sizes and commonly used and available.

The DI is the final polish for RO filtration that removes what remains dissolved after the RO membrane. The final product is super clean and provides a great product for top off or for mixing new saltwater with.

 

[MegabiteOG]

An RO unit without a DI usually leaves 2 - 5 PPM of impurities. It's not much, but you don't know what those impurities are. The DI finish's it off and leaving no impurities. As per gallon per day, most will do the job you need. I'd look for the more efficient ones that has less waste per gallon of RODI delivered.

 

[WBJ]

Thanks, and this may sound dumb, but do I just turn the unit off when I have the 30 gallons I need, or after 5 gallons for one week?

 

[TheNative192]

Thanks, and this may sound dumb, but do I just turn the unit off when I have the 30 gallons I need, or after 5 gallons for one week?

Using an RODI system is helpful because you don’t have to keep running to the store for water—you can make your own clean water and saltwater right at home. Most units can be easily hooked up to a sink and then packed away when you’re done. For example, if you need 5 gallons for the week, you just connect it to your sink, make the 5 gallons, and store it.

People with larger tanks sometimes install their RODI systems permanently with a float valve so it’s always making water as needed, but that setup requires extra space, plumbing skills, and can get messy if something goes wrong.

Typically, the system isn’t running all the time. Like today, I needed to refill my RODI supply, so I made 5 gallons—it took about an hour using the 5-Stage BRS Pro system at 75 GPD. You should never leave it running when you’re not home, just in case something leaks—it can turn into a disaster (lol).

The first filter stages bring down the TDS (total dissolved solids) to around 2–15 (depending on how bad your water supply originally is), and the DI resin finishes the job by bringing it down to 0 TDS. Water with 0 TDS is considered pure RODI water and safe for your reef tank.

 

[WBJ]

Thanks for the info, that answered my question!!

 

[MikeReefs]

I'm looking to purchase a RO/DI system and have an output question. Between water top off and changes, I use about 30 gallons per month, and I buy RO water for .20 per gallon. What do I gain with DI, and why do all the sites say I need an output of 75 gallons per day? Your help in solving my confusion is greatly appreciated!

The GPD is how fast the rodi unit can produce your water. Higher gpd the faster it is to full your buckets. In your case you only need 30g a month 75 is suitable. I have a 75 and it takes approximately 1hr20min to fill a 5G bucket