RO/DI unit advice

[fordman460]

Found this on Ebay. Good deal??? Thank you.

[Steven Pro]

The 100 gpd membranes are not supposed to be as good as the 75 gpd membranes. They let more stuff through. Which means you will go through more DI resin.

As for the brand, I never heard of them. I always use SpectraPure for RO units.

[fordman460]

Thank you for the advice. Theres so much to learn and so little money to goof up buying the wrong things.

[SnelgroveReefer]

I have never used or heard of this brand, but I did buy my RO/DI unit from ebay. Mine is an Aqua-Safe 6 stage that I got for around $150 USD. I have had it for a year and it is great. My home water TDS is about 150 ppm and the Aqua-Safe brings it down to 7ppm! My tanks loves it. I think you can just do a search on ebay and you will find them. They were a great company to deal with, everthing arrived in perfect condition and the transaction went perfect.

[fordman460]

I have never used or heard of this brand, but I did buy my RO/DI unit from ebay. Mine is an Aqua-Safe 6 stage that I got for around $150 USD. I have had it for a year and it is great. My home water TDS is about 150 ppm and the Aqua-Safe brings it down to 7ppm! My tanks loves it. I think you can just do a search on ebay and you will find them. They were a great company to deal with, everthing arrived in perfect condition and the transaction went perfect.

Thanks Mark, I searched Ebay and found the ones you mention. Seems like a good deal. Price is very decent even when factoring in shipping. Thank you.

[golfish]

You want to stay away from the 100 gpd or more units. They use drinking water RO membranes that have a rejection rate or 90%..The lower gpd units have a 98% rejection rate.

From what I've been seeing lately your going to get a 100 gpd membrane from ebay, no matter what the info says, if its cheap and new.

try these places



http://www.purelyh2o.com/


http://www.airwaterice.com/

[fordman460]

Great thank you.

[thundermoon]

ok first not sure how to make this as pretty as the firston but i was looking on ebay and found this unit and was wondering how it would work i really am on a tight budget to get started so that is the bigest reason for the 100gpd filter.
http://cgi.ebay.com/New-Reef-6-st-10...QQcmdZViewItem

can anyone give me any ifo on this unit.

[Steven Pro]

ok first not sure how to make this as pretty as the firston but i was looking on ebay and found this unit and was wondering how it would work i really am on a tight budget to get started so that is the bigest reason for the 100gpd filter.
http://cgi.ebay.com/New-Reef-6-st-10...QQcmdZViewItem

can anyone give me any ifo on this unit.

In the long-run, that unit will likely cost much more money than buying a better unit now. It's 100 gpd membrane will permit more junk to pass through and use up more DI resin. Secondly, that DI cartridge is rather small, mounted horizontally, and in a white casing. Since it is in a white casing, you won't see when it is used up and no longer working. Being mounted horizontally encourages channeling and by-pass of the resin. And, since it is so small and teamed with a poor performing RO membrane, I doubt it will last very long given average tapwater and usage.

Here are things I look for in a good RO/DI unit:
1.) Clear housing for both the prefilters and DI cartridge
2.) Vertically mounted DI cartridge
3.) 98% rejection membrane
4.) Pressure gauge

[thundermoon]

ok from what i can tell from pictures all the ro/di units have the horizontal cartrages on them and three clearones hanging vertical. how can i tell the diferance.

[Steven Pro]

ok from what i can tell from pictures all the ro/di units have the horizontal cartrages on them and three clearones hanging vertical. how can i tell the diferance.

All of the units you have seen have horizontal cartridges? Let me guess, you have searched eBay almost exclusively? Some RO/DI units have horizontal actiavted carbon cartridges for drinking/taste. But, they are not necessary. Three vertical cartridges (1 sediment prefitler, 1 carbon prefilter, and 1 DI cartridge) are all that are needed.

[thundermoon]

ok thank you

[BubbaWPB]

Check out one of our sponsors, AquaFX at http://www.aquariumwaterfilters.com/ . They manufacture RO/DI units for some of the other sponsors. I'm very satisfied with mine.

[justdrew424]

Mine is an Aqua-Safe 6 stage that I got for around $150 USD. I have had it for a year and it is great. My home water TDS is about 150 ppm and the Aqua-Safe brings it down to 7ppm! My tanks loves it.

I wouldn't categorize that as great performance. My tap TDS is about 635. My RO/DI gets that down to 0. Something is not working correctly if you are only getting down to 7 TDS. I replace my DI cartridge once I get into the 2-3 TDS range. I wouldn't put 7 TDS into my tank. A quality RO/DI will get get your water to 0.

Later
Drew

[rjs5134]

I haven't produced newly filtered water in some time, but have been working off the stockpile I have. The current filter media is clearly in need of replacement. The question is, are most filter cannisters a standard size and can the performance be increased by purchasing the better cartridges? If so, it would seem that a cheaper system with the more expensive(better) filter media would be the way to go, if the $50-100 makes a big difference.

[Unresistible Blue]

The question is, are most filter cannisters a standard size and can the performance be increased by purchasing the better cartridges? If so, it would seem that a cheaper system with the more expensive(better) filter media would be the way to go, if the $50-100 makes a big difference.

Most filters used in this hobby are of a standard size.

However, if you go with a cheaper system you may get an off brand/lower quality membrane, horizontal or small DI resin cartridge, no pressure gauge, no DI bypass valve, non refillable cartridges....

[John Hamilton]

Here are things I look for in a good RO/DI unit:
2.) Vertically mounted DI cartridge

Why?

[rjs5134]

Blue,

I already have my RO/DI system. I needed new filter inserts and was asking if they were generally a standard size. If they are fairly standardized then I could purchase replacements of high quality and achieve the water quality we all strive for. I've recently purchased the replacements and think I upgraded.

[Steven Pro]

Why?

With a vertically mounted DI cartridge, the water is forced to pass through the resin. When they are mounted horizontally, the resin can settle, permitting the water to flow up and over the resin and by-pass it.

[John Hamilton]

With a vertically mounted DI cartridge, the water is forced to pass through the resin. When they are mounted horizontally, the resin can settle, permitting the water to flow up and over the resin and by-pass it.

Thanks.