RO units brands

[DaveAngie79]

although i dont have one yet its me next purchase
i would get a storage tank with it or when you need the water you will wait all day for a few gallons

 

[lbear]

I installed Kent Marine Maxxima Hi-S 60 gpd last week. It comes with pressure gauge and TDS. More expensive and 4 stages only. I wish this thread appeared earlier. I bought it from marinedepot.

How do think about Kent Marine unit?

I found my tap water pressure is 45 psi and ordered a booster pump on Monday. According to the seller, the pump is installed right before the DI stage. Is it a good idea to do it?

 

[purelyh2o]

Hmmm...

Hmmm...

The Kent system is a good unit based on the opinions of alot of people out there that have them.

The pump does not go just before the DI. The pump can be installed in one of 2 places.

#1) You can install the pump just before the entire system. The pump is intended to force more pressure to the face of the membrane which is the only place on the system that needs pressure so installing it before the DI which is after the membrane would defeat the purpose of the pump.

#2) You can install the pump after the prefilters (sediment and carbon). This installation is used if you are on a well or have a water source that is high in particulates that may damage the pump. If this is not the case with your water supply it would be easier to just install it on the input line to the system.

Good Luck!
Bryan Crenshaw

 

[Pandora]

Re: Well...

Re: Well...

<a href=showthread.php?s=&postid=6654546#post6654546 target=_blank>Originally posted</a> by purelyh2o
I keep hearing this defense that If Im getting 0 TDS Im getting zero TDS. NO!...lol, The fact is that the TDS meter only measures things that are conductive and frankly the main concerns that we have in this hobby are not conductive and will not show up on a TDS meter.

Ok, I'll bite, then...

What specifically are these tap water compounds that we should be "mainly" concerned about in the hobby that do not show on the TDS meter? Because obviously most hobbyists are not going to have RO membrane rejection rate measuring equipment (BTW, how do you guys measure rejection rate if not by conductivity?), and the standard that has been used on a hobbyist scale has been using TDS conductivity meters, I am genuinely curious. In water, phosphates, nitrates, nitrites, chlorine, chloramine, trace metals, all exist as charged ions that would be picked up by TDS meter. Most nonconductive compounds are hydrophobic (like hydrocarbons) and would not dissolve well in water. About the only significant things I can think of that can include carbon dioxide, large particulates (if you are letting this stuff go through, then your membrane has bigger holes in it than a sieve and consequently letting the other above things through) and rarer things like silica. Either way, conductivity will still be a very good estimate of overall TDS.

 

[6Speed]

<a href=showthread.php?s=&postid=6650480#post6650480 target=_blank>Originally posted</a> by AZDesertRat
[/B]

Ok, so I'll move my DI cartridge so that it is vertical.

 

[sidjam]

Is there anything that could be coming through the system that would not register on the TDS meter? Some type of non-charged compound that would have very low conductivity?

Small neutral organics that got through the RO membrane. Chloroform, etc.If the carbon is bad or inadequate, chloramine might get all the way through. Gases like O2 will pass through.H+ or OH- might get through if one half of the resin becomes depleted first.I discuss all these issues in:Reverse Osmosis/Deionization Systems to Purify Tap Water for Reef Aquaria and What is TDS?

http://reefkeeping.com/issues/2005-05/rhf/index.htm http://www.reefkeeping.com/issues/2004-04/rhf/feature/index.htm

 

[fishman805]

Re: Re: Well...

Re: Re: Well...

<a href=showthread.php?s=&postid=6655781#post6655781 target=_blank>Originally posted</a> by Pandora
Ok, I'll bite, then...

What specifically are these tap water compounds that we should be "mainly" concerned about in the hobby that do not show on the TDS meter? Because obviously most hobbyists are not going to have RO membrane rejection rate measuring equipment (BTW, how do you guys measure rejection rate if not by conductivity?), and the standard that has been used on a hobbyist scale has been using TDS conductivity meters, I am genuinely curious. In water, phosphates, nitrates, nitrites, chlorine, chloramine, trace metals, all exist as charged ions that would be picked up by TDS meter. Most nonconductive compounds are hydrophobic (like hydrocarbons) and would not dissolve well in water. About the only significant things I can think of that can include carbon dioxide, large particulates (if you are letting this stuff go through, then your membrane has bigger holes in it than a sieve and consequently letting the other above things through) and rarer things like silica. Either way, conductivity will still be a very good estimate of overall TDS.

You make a VERY good point and I think "as hobbiests" , the best we can do is go with what we've got on the market..... Most of us don't work for or have the resorces at our disposal like some folks that work at waste water purification facilities or have access to "pure" ocean water....

If the mandate is that we all have ( and provide ) perfect ocean conditions for our tanks,then we're all screwed and should get out of the hobby altogether .... On the other hand, if it's simply our "charge" to provide the best that we can with what we've got, then we're ok...... After all, SW Reef keeping has been going on for a very very long time and I've seen alot of very succesful reef tanks here in RC....

IMO, the current technology ( TDS Meters ) are more then sufficient and I think that anything else that gets by our "best" filters probably already exists in great quantities in Mother Natures Oceans already....

Cheers

Bob

 

[cato]

I have a Kent RO/DI High-S unit and am happy with it. Reflecting back, off the subject...I used to own a Jeep Wrangler. Bought it brand new. 4 wheel drive, ran great, and it was fun. Recently traded it in for a new Jeep, but a Grand Cherokee 4 wheel drive, runs great, etc.

Point, there both Jeeps, both ran great, take me from point A to point B, both even run on the same gas! Can you imagine that? realistically, there is no comparison. Like night and day. IMHO you get what you pay for.

Just my $.02.