Ro/di?

[creep]

Does anyone here use this unit. The price is really attractive. I know there are going to be a bunch of people suggesting airwaterice.com, and other sites, but the truthe is, i don't have $200 to spend on a unit, but i could muster up $100 as long as this is a decent system.

 

[theatrus]

Its not bad, but look into replacing the membrane in the unit with a 75GPD Dow filmtech one. The 110ish GPD membranes are more nano-filters than true membranes. They also work poorly under low water pressure (slow).

 

[stereomandan]

To be honest, they all work very well. Try it out and measure the TDS ( a TDS meter is cheap and essential anyway).

If it starts to put out higher TDS levels, change the membrane out as mentioned above.

Dan

 

[T Man]

Re: Ro/di?

<a href=showthread.php?s=&postid=8053152#post8053152 target=_blank>Originally posted</a> by creep
Does anyone here use this unit.

I bought that exact unit, it has served me well as my topoff source. I'm also looking at the UV sterilizer that store sells.
The cartridges and resins are readily available and the price is right. The end results are the same as higher priced systems, for half if not a third less in cost..........I'm satisfied. Tinman

 

[creep]

good to hear. I will be purchasing this as soon as i can then. thanks everyone for your input.

 

[mg426]

Ever looked at these WWW.purelyh2o.com ??

 

[jeffbrig]

I strongly recommend getting a 75gpd membrane instead of a 110gpd. The 110 is only about 90% effective at removing contaminants, while the 75gpd is 98% effective. That means you'll consume DI resin 5 times faster when using the 110. The cost of replacing DI resin will add up quickly. Going to the slightly lower production membrane will save you lots of money over time.

 

[RichConley]

<a href=showthread.php?s=&postid=8056218#post8056218 target=_blank>Originally posted</a> by jeffbrig
I strongly recommend getting a 75gpd membrane instead of a 110gpd. The 110 is only about 90% effective at removing contaminants, while the 75gpd is 98% effective. That means you'll consume DI resin 5 times faster when using the 110. The cost of replacing DI resin will add up quickly. Going to the slightly lower production membrane will save you lots of money over time.

jeffbrig, that all depends on how high your tap TDS is. I've got a 100gpd membrane, but my tap is only about 40ppm TDS, so i'd be replacing DI as routine maintenance faster than I run through it either way, so in my case, and many others, theres no way to justify the higher rejection membrane, and increased cost.

 

[dbrock12]

I purchased the exact same unit a couple of years ago. It is a good system, I did however make a couple of modifications to mine after the first six months of usage. I changed to a 75 gpd membrane, because they do have a higher rejection rate (98% vs 90%)and more importantly in my opinion, I eliminated the rather small and horizontal mounted DI cartridge. I replaced it with a full size upright cartridge. The reason for this is that all DI media shrinks with usage and the horizontal cartridge will leave a channel on the top portion of the cartridge for the water to travel thru with no contact with the DI media. Using a vertical cartridge, even after the media shrinks, the water still must travel from the bottom to the top of the cartridge, allowing for full contact with the DI media. This cartridge will also hold almost twice as much DI as the one this unit originally comes with, which allows for longer intervals between changes. Mine has worked great for me ever since.

JMHO
Don

 

[AZDesertRat]

You would be money ahead and hve better water quality if you just buy a better unit to begin with. That unit is mediocre for drinking water and horrible for reef quality water. As dbrock pointed out he upgraded his but he now has as much invested as if he had bought the good one to begin with. They are right next to junk and in now way do they compare to ubits like the Typhoon III, Optima or MaxCap RO/DI. Stereoman was incorrect with his statement they all work very well, it couldn't be farther from the truth.

 

[jeffbrig]

<a href=showthread.php?s=&postid=8056783#post8056783 target=_blank>Originally posted</a> by RichConley
jeffbrig, that all depends on how high your tap TDS is. I've got a 100gpd membrane, but my tap is only about 40ppm TDS, so i'd be replacing DI as routine maintenance faster than I run through it either way, so in my case, and many others, theres no way to justify the higher rejection membrane, and increased cost.

True, initial tap tds will make a difference in how much work your DI has to do. Much like you, mine is typically ~30ppm, but I think we're both way below the average levels.

Still, why would you replace a DI cartridge for maintenance? I measure water going in and out of my DI, and as long as it's still producing 0ppm, it doesn't need to be changed yet. My original DI cartridge is going on 16 months, and I estimate I've run about 2000 gallons of water through it. It looks to be just over halfway gone (color changing resin). If I was using the 100gpd membrane, I'd probably be on my 3rd DI cartridge right now.

It's a fact that a 100gpd membrane vs. a 75gpd results in the DI cartridge soaking up 5x as much tds. The higher the initial tds, the more of an impact this will have on the owner's pocket.

 

[creep]

well i wrote the company and they are willing to switch out the membrane to the 75gpd membrane for me. Also they said the DI unit can detach from the top so i can hang it veritcally instead of horizontally. So this unit is looking better and better, and still only $100.

 

[AZDesertRat]

Hanging that hollow tube vertically is not going to give you the same results that a treu vertical DI filter will. True it may make it better than it was but its still just a hollow tube not a filter that directs flow and holds 24 oz of resin.