was just wondering if this would be a good rodi unit or not it is on ebay http://cgi.ebay.com/Zero-0-ppm-Reef-6st-Reverse-Osmosis-RO-DI-Water-Filters_W0QQitemZ120396604622QQihZ002QQcategoryZ20756QQcmdZViewItemQQ_trksidZp1742.m153.l1262?_trksid=p1742.m153.l1262
hopefully yhr link works i dont no i put this in right
Thats the exact one I have and works perfect.
There are a few things i dont like about it. One is it has a 100gpd membrane on it. They advertise this membrane as a RO membrane but its really a micro filter. From their example they say that with tap at 300ppm after this membrane the tds is 20ppm that a 95% rejection rate but later in the add they say the membrane will remove 98% to 99.99% so there is a little bit of false advertising going on there.
Also the DI part is horizontal and what will happen is the water will flow over the top of the resin and not be completely filtered. also with a DI part that small and only a 95% rejection rate you are going to go through the resin very quickly.
Stick to 75gpd unit’s that use Dow filmtec membranes
Looked at mine and it looks like a 50 gallon per day membrain, the DI chamber is a little bigger but is Horizontel. I’ll hafe to fix that.
well if im desperatly in need of an rodi unit do u think this one would work fine? i dont have alot of money 2 spend on it so this is like my max i could spend
It would probably work to remove some crap from the water. It would be better then tap water and some people run reef tanks with tap water for a little while.(before they quit the hobby or get tired of dead corals/too much algae and buy an RO)
So it would be better then nothing, but really when you are spending $100 why not spend a little more and do it right. You’ll find countless times in the hobby if you buy cheap parts you’ll end up upgrading and the used parts will sit in your closet for a year until you sell them at 1/10th what you bought them at. Same goes with skimmers, power heads, and lighting.
Most RO units are made with standard interchangeable parts, so often all you’re looking at is what parts are included with a certain package and if they are put together right. The plastic housing that the membranes and filters are put into are some of cheapest parts. If you bought this and then bought a different RO membrane along with a kit to adjust your amount of waste water(which you would need to do to use a different gpd membrane) then you are likely spending more money then you would to just buy something that has all the parts you want put together.
All this is just my two cents. Honestly I am not sure what exactly is the best bang for your buck as I haven’t shopped for an RO unit in 6 months and in 6 months prices and products have changed.
Those were my first thought too, Chris. it looks a little like its made out of spare parts. if the Membrane is weak, and the carbon filters are only 3 micron, the DI carries the load but will exhaust quickly. DI media is much more expensive than a good membrane and pre filters in the long run. Its not that much less than good brand name units which come with service help. well its not a DOW filmtec membrane, which is another down point.
The proper design concept of a good unit is the sediment filter removes the solid particles so they dont plug up the membrane pores, the carbon filter removes chlorine so it doesnt eat holes in the membrane, and then the membrane should remove 97% or better of whats left in the water after the prefilters, followed by a little final polishing by the DI media to remove the last 3% and VOILA! Pure RODI water!!
[quote=“Gordonious, post:6, topic:1441”]
So it would be better then nothing, but really when you are spending $100 why not spend a little more and do it right. You’ll find countless times in the hobby if you buy cheap parts you’ll end up upgrading and the used parts will sit in your closet for a year until you sell them at 1/10th what you bought them at. Same goes with skimmers, power heads, and lighting.[/quote]
+1