RO/DI help

[tjclark177]

So im trying to figure out what brand RO/DI system to get but dont know much about what I need. I have a 75 gallon tank. How many gallons a day should my system be able to cycle through? and do you use it only to set up the initial water in your tank? or keep it running forever as long as I have my tank? Im new to the saltwater family haha

 

[oowtfmang]

I would just go with a brand new unit from BRS, whatever you can afford. 75 GPD sounds pretty good. You use it to set up your initial water, top off (fresh water added to your tank to compensate for evaporation) as well as the new salt water you make for water changes. It's good to invest into a good one that will last long. It's great that you're willing to commit to the proper equipment. Good luck

 

[scooterc268]

I would just go with a brand new unit from BRS, whatever you can afford. 75 GPD sounds pretty good. You use it to set up your initial water, top off (fresh water added to your tank to compensate for evaporation) as well as the new salt water you make for water changes. It's good to invest into a good one that will last long. It's great that you're willing to commit to the proper equipment. Good luck

Couldn't say it better myself! Good info


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[cdness]

BRS, Air Water Ice, Spectrapure, The Filter Guys, etc all have great systems and service. There are others I probably missed, but those are the specialized vendors I know of. There are also off the shelf stuff by other brands that you can find at many different places that sell hard goods as well.

RODI is RODI as long as it hits 0 TDS (total dissolved solids). There are a few things to watch out for though:

1. Rejection ratio of the membrane - The higher percent = longer DI life
2. Get good quality pre-filters to protect the membrane.
3. Check your local water quality report to see if there are any special needs you should be aware of like removal of chloramines.
4. Depending on water price in your area, investing in an efficient unit may pay for itself in a year or two.
5. Depending on water pressure or temperature, you may need a pressure booster to get the best efficiency from the unit...

 

[fragmatic]

I don't know your budget needs, but if you can afford to spend a few extra $$, get one with the TDS meter built in. If you don't know what this is, it is a meter that measures the conductivity of the water. Pure water does not conduct electricity. So, this meter is calibrated to convert conductivity into parts per million. We use this number to know if our RODI system is doing what we need it to do. It does not mean the water is absolutely pure if it reads .000, but, it does give us a really good reference to go by. Not all elements in water conduct electricity, so technically it could have something in it we don't know about. However, all the heavy metals and many of the other problem elements we are concerned with do effect water's conductivity. When in time the meter starts to read around .005 (this is my opinion) I know it is time to change my DI filter. Every other time, I replace all my filters. It takes awhile to need them changed depending on how much RODI water you make.

In my case I have a system that automatically fills my tank to comp for evaporation. I do this by having a small tank (mine is a used 3 gallon fountain water bottle). Then water from that tank is gravity feed to my sump. Both of these locations have water level indicators. The reason we like to feed a small tank first is to prevent the RODI from being turned on and off frequently. We don't like the first small amount that comes out each time it is turned on. So, by filling a small tank which only refills when the water level is really low in it, we reduce the RODI starts per volume of water produced.

Is that as clear as mud?

 

[tjclark177]

thanks everyone this was very helpful!