RO units
- Thread starter jjdsurfer
- Start date
If you have a look at Drs Foster and Smith website, they have a good little range of RO units...Obviously, the GPD ( gallons per day ) you choose is really dependant on how much want to spend and how much RO water you want to produce in any given day..
On filling your tank, start off on the right foot and use RO straight from the off...
Niko
On filling your tank, start off on the right foot and use RO straight from the off...
Niko
thefilterguys.biz -- you'll get a much better RO/DI unit at a better price than Drs. F & S. They are reefkeepers, use their own products, and can help you put a unit together to fit your specific needs.
Use only RO/DI. Tap water can cause all kinds of issues, unless you are one of the incredibly few that has really pure water coming out of your tap.
Use only RO/DI. Tap water can cause all kinds of issues, unless you are one of the incredibly few that has really pure water coming out of your tap.
Hey guys, I have a question about ro vs di units....
I read that ro units have a horrible efficiency rate... like 85% of the water is filtered out as bad water... and only 15% gets through as "Clean" water... I am doing 100+ gallon water changes weekly and I really need to buy more than one unit so I can have extra water ready.... (Monthly I do 300+ gallon water change)... I also read that DI units are up around 90% efficiency vs 15% for ro... any truth to this????
I read that ro units have a horrible efficiency rate... like 85% of the water is filtered out as bad water... and only 15% gets through as "Clean" water... I am doing 100+ gallon water changes weekly and I really need to buy more than one unit so I can have extra water ready.... (Monthly I do 300+ gallon water change)... I also read that DI units are up around 90% efficiency vs 15% for ro... any truth to this????
A 100gpd (or higher) RO membrane removes ~90% of the TDS from the incoming water. A 75gpd (or less) RO membrane removes 95 - 98% of the TDS from the incoming water. RO is a waste intensive purification process. For every 1g of good water coming out of a RO membrane, there is typically 4g of waste water. If operating conditions are less than ideal, that ratio of 4:1 can easily go up to 5:1 or even 6:1 (temperature and pressure are important factors).
Using only DI, there is no waste, as the water is pushed through the DI resin and out the other end. However, for most people, it is much more expensive to use only DI due to their incoming water quality, how quickly DI resin is used up, and the relatively high cost of constantly replacing the DI resin (compared to the relatively low cost of water).
That said, the best water purification method for the bulk of us is a RO/DI unit. The RO membrane removes most of the impurities, flushing them down the drain, while the DI follows up on the RO product water by removing any remaining ions, ultimately producing water with 0 TDS.
In looking to buy one or more units to handle that much water per week, Freddybnj, I would highly recommend testing the TDS of your incoming water before spending the money on any unit. Once you get a rough idea of what the incoming TDS is, you can better decide which type of unit (RO, DI, or RO/DI) will work best for you. Although, any 75gpd RO membrane (be it on just a RO unit or on a RO/DI unit) would be able to make enough water for a weekly water change in < 2 days. If you had the system automated with float switches in your storage container(s), it wouldn't require much attention at all while making water for you.
Using only DI, there is no waste, as the water is pushed through the DI resin and out the other end. However, for most people, it is much more expensive to use only DI due to their incoming water quality, how quickly DI resin is used up, and the relatively high cost of constantly replacing the DI resin (compared to the relatively low cost of water).
That said, the best water purification method for the bulk of us is a RO/DI unit. The RO membrane removes most of the impurities, flushing them down the drain, while the DI follows up on the RO product water by removing any remaining ions, ultimately producing water with 0 TDS.
In looking to buy one or more units to handle that much water per week, Freddybnj, I would highly recommend testing the TDS of your incoming water before spending the money on any unit. Once you get a rough idea of what the incoming TDS is, you can better decide which type of unit (RO, DI, or RO/DI) will work best for you. Although, any 75gpd RO membrane (be it on just a RO unit or on a RO/DI unit) would be able to make enough water for a weekly water change in < 2 days. If you had the system automated with float switches in your storage container(s), it wouldn't require much attention at all while making water for you.
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Thank you very much.... sounds like a plan...
I have an email out to the filter guys... and awaiting their response.. (Seems to be a nice site!) I will follow your advice and check tds and move forward from there. Thank you .
I have an email out to the filter guys... and awaiting their response.. (Seems to be a nice site!) I will follow your advice and check tds and move forward from there. Thank you .