ejaustin Posted November 30, 2006 Share Posted November 30, 2006 Hi, everyone, Well, I've finally moved into my house. blob7.gif That means it's time to start getting serious about getting a good infrastructure for my tanks. I think the first thing I'll do is set up an RO/DI system. I think I want these features: - in-line TDS (probably before and after DI) - the ability to tap post-RO, pre-DI for human consumptiom I don't know what I need as far as capacity. (I expect to have a 145 gallon tank, a 75 or 90 gallon tank, and I will keep the 29 gallon tank I currently have to use as a QT.) I've also heard something about clear cylinders that I think help you know when it's getting to be close to time to change a filter or maybe it's the DI membrane... not clear about that. What else should I consider? Are there any brands to steer clear of? Is there anything like a standard size for the filters that will give me more options of vendors when it's time to get new filters? ej PS Ben, please check your PMs. I need to make arrangements to get the tank to my house. Quote Link to comment Share on other sites More sharing options...
reefman Posted November 30, 2006 Share Posted November 30, 2006 One thing you need to consider is it's capacity (usually expressed in GPD, or gallons per day). Keep in mine that means how much it will produce in a 24 hour period. Also, my experience has been it DOES NOT produce the amount of gallons it says its rated for. It's not an issue, because I keep several 5 and 6 gal jugs topped off that I use for my water changes. As soon as I empty one, I begion refilling it, and then rotate the jubs I'm working from. Not optimal, but works for now. I do have a larger Coralife one I will get set-up and working one day, but for now this works. This may not work because you are going to have several tanks (I have 2 90G's, but have decided that will change eventually to one larger one. In my opinion, you do an equal amount of work for each tank, which at times gets tiresome and stressfull), but you may want to consider whether you will want to be able to set up the RO/DI unit to go directly into an auto-top off system (also another thing I'm dreaming about for some day. I'm tired of toting buckets.). Stephen Quote Link to comment Share on other sites More sharing options...
caferacermike Posted December 1, 2006 Share Posted December 1, 2006 I've been reading thousands of posts about RO/DI units. The sum of it all reads. Buy Dow FilmTech 75gpd membranes. They have the best rejection rates. If you need more flow per day get another membrane housing and a second Filmtech membrane. The second thing I've added to my personal list s that you might wish to remove the DI unit and mount it vertically. This improves the contact time as the water will not just flow over the resin as it lays flat in the housing. I've found Buckeye field supply to be the friendliest RO company handsdown. I don't care if it's online or in person. I've seen this company walk hundreds of people through their RO units, including myself. Quote Link to comment Share on other sites More sharing options...
thedude Posted December 1, 2006 Share Posted December 1, 2006 Actually the Dow Filmtech 50 GPD membrane technically has the best rejection rate. Remember to pass your water through carbon and sediment before the RO to help the filter to last longer. Quote Link to comment Share on other sites More sharing options...
JimD Posted December 2, 2006 Share Posted December 2, 2006 Im using a Spectrapure Plus 60gpd with a tested rejection rate of 98.5 and Im very happy with it, a little pricey though. Rejection rates will lessen with more gpd, a typical 100gpd membrane will have rejection rate of around 90, so Id stick with a 75gpd or less. And I second Buckeyefield, Ive been doing business with Russ for years. Quote Link to comment Share on other sites More sharing options...
thedude Posted December 2, 2006 Share Posted December 2, 2006 Personally I use AquaFX units in both the store and at home. The unit is mounted to a sturdy aluminum bracket and the owner is one of the nicest ladies I've met. Their website is http://www.aquariumwaterfilters.com/ John Quote Link to comment Share on other sites More sharing options...
Buckeye Field Supply Posted May 17, 2008 Share Posted May 17, 2008 Thanks for the support folks. Filmtec 50 and 75 gpd membranes are spec'ed at 250ppm feedwater at 77 degrees F and 50 psi, and both have a stabilized salt rejection rate of 98%. The Filmtec 100 gpd is spec'ed at 250 ppm feedwater at 77 degrees F and 50 psi, and has a stabilized salt rejection rate of 90%. We have a 150 gpd membrane now that is spec'ed at 250 ppm feedwater at 77 degrees F and 60 psi, and has a stabilized salt rejection rate of 98%. If you don't have conditions that match the factory spec's (few do), we have a calculator on our site that allows to to calculate how much your membrane should produce given your conditions (temperature and pressure). Russ Quote Link to comment Share on other sites More sharing options...
Buckeye Field Supply Posted May 17, 2008 Share Posted May 17, 2008 . Quote Link to comment Share on other sites More sharing options...
chrismunn Posted May 18, 2008 Share Posted May 18, 2008 ive got a question. i did no research on ro units when i bought mine, and i lost the papers for it years back. its a spectrapure 60gpd MP/DI.... first of all, whats MP/DI stand for? i know what the di part is, but whats the mp part? and which blocks should i use to replace these old ones? i know that the di is a color change, but thats all i know... Quote Link to comment Share on other sites More sharing options...
Buckeye Field Supply Posted May 18, 2008 Share Posted May 18, 2008 and which blocks should i use to replace these old ones? i know that the di is a color change, but thats all i know... Assuming you are on city water, and you don't have chloramines: a 1 micron sediment filter a 0.6 micron 20,000 gallon carbon block and a refillable DI resin cartridge with color changing resin Russ Quote Link to comment Share on other sites More sharing options...
chrismunn Posted May 18, 2008 Share Posted May 18, 2008 thanks russ! Quote Link to comment Share on other sites More sharing options...
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