RO/DI question
- Thread starter Ensiferum321
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Bulk reef supply carries a RO/DI UNIT that has a chloramine filter but my unit seem to filter it out without it. Maybe they could help you figure it out.
Chloramines DO NOT, I repeat DO NOT need special carbons and you are wasting your money buying them.
The average chloramine redsidual level in the US is 1-2 ppm and this is easily withing the capabilities of a good 1 micron or less carbon block. Don't waste your money and foul up your membrane with catalytic carbons which are usually granular in nature and actuall grind to dust and fplg whatever follows that filter ie the membrane or a second carbon filter.
It is the DI resin that is most important not the carbon. THe ammonia portion of chloramines is tough for a RO membrane to remove and the carbon does not touch it. It is removed by a good full size vertical DI filter using high quality resins and with good contact time.
To answer your question you want a good sediment filter, the lower the micron rating the better and absolute rated is much better than nominal rated. You want a single 0.5 or 0.6 micron 20,000 gallon carbon block. You want a system based around a Dow Filmtec 75 GPD RO membrane or a GE Water 100 GPD RO membarne which is essentially the same thing in actuality. You want a minimum of one good full size 20 oz 10" vertical DI filter filled with the best fresh, nuclear or semiconductor grade DI resin you can find. You will also an inline pressure gauge and a good handheld TDS meter to trobleshoot it all as it is the only way to know how well it is performing. Things like a capilary tube flow restrictor and also a plus and a DI bypass valve is a good feature so you can use RO only water for uses like drinking and cooking or RO/DI for the tanks.
A couple suggestions are the 90 GPD system on sale here:
MAXPURE MPDI SYSTEM
THe 75 GPD BFS-161 Premium foound here:
http://www.buckeyefieldsupply.com/showproducts.asp?Category=168&Sub=166
or maybe the Optima Vision found here:
http://www.purelyh2o.com/index.php/...page=flypage.tpl&product_id=23&category_id=79
Don't waste money on things that do not offer any value like dual carbons, small horizontal DI filters, 150 GPD membranes that do not work out well in testing, flush valves and personally I do not endorse inline TDS meters because of their limited accuracy and versatility since they are dedicated to two points only and you need three TDS readings to test a RO/DI syetm.
The average chloramine redsidual level in the US is 1-2 ppm and this is easily withing the capabilities of a good 1 micron or less carbon block. Don't waste your money and foul up your membrane with catalytic carbons which are usually granular in nature and actuall grind to dust and fplg whatever follows that filter ie the membrane or a second carbon filter.
It is the DI resin that is most important not the carbon. THe ammonia portion of chloramines is tough for a RO membrane to remove and the carbon does not touch it. It is removed by a good full size vertical DI filter using high quality resins and with good contact time.
To answer your question you want a good sediment filter, the lower the micron rating the better and absolute rated is much better than nominal rated. You want a single 0.5 or 0.6 micron 20,000 gallon carbon block. You want a system based around a Dow Filmtec 75 GPD RO membrane or a GE Water 100 GPD RO membarne which is essentially the same thing in actuality. You want a minimum of one good full size 20 oz 10" vertical DI filter filled with the best fresh, nuclear or semiconductor grade DI resin you can find. You will also an inline pressure gauge and a good handheld TDS meter to trobleshoot it all as it is the only way to know how well it is performing. Things like a capilary tube flow restrictor and also a plus and a DI bypass valve is a good feature so you can use RO only water for uses like drinking and cooking or RO/DI for the tanks.
A couple suggestions are the 90 GPD system on sale here:
MAXPURE MPDI SYSTEM
THe 75 GPD BFS-161 Premium foound here:
http://www.buckeyefieldsupply.com/showproducts.asp?Category=168&Sub=166
or maybe the Optima Vision found here:
http://www.purelyh2o.com/index.php/...page=flypage.tpl&product_id=23&category_id=79
Don't waste money on things that do not offer any value like dual carbons, small horizontal DI filters, 150 GPD membranes that do not work out well in testing, flush valves and personally I do not endorse inline TDS meters because of their limited accuracy and versatility since they are dedicated to two points only and you need three TDS readings to test a RO/DI syetm.
Ensiferum321
Active Member
AZ Desert, cannot thank you enough for that great information! Wow, if only others would give such great detail to their answers. Kudos to you my friend. Also thank you for pointing me in the right direction for a new RO/DI system, looks like I'll be going with the 90GPD from MAxpure
