What is a good RO system

[Eric peterson]

right lol i looked them all up and it looks like im going to go with spectrapure, thank you everyone for your input its greatly appreciated and when i get my tank up and running i will definitely be sharing it with all of you guys

 

[thehammer1985]

Heck ya Def a good way to go . I'll brag em up and down

 

[Eric peterson]

http://spectrapure.com/RO-RODI/RODI-SYSTEMS/MaxPureMPDI-90-GPD-RODI-System

This is what i ended up getting

 

[JakeK]

Spectrapure refurbished 90 GPD.

 

[thehammer1985]

http://spectrapure.com/RO-RODI/ADD-ONS/MaxCap-D1-Single-Stage-DI-System-Add-On-OPEN-BOX

http://spectrapure.com/HM-Digital-SM-1-In-Line-Single-Probe-TDS-Meter?filter_name=Tds

Without sounding like a sales guy I strongly suggest these place the max cap before silica buster it'll drastically extend the life of it . Also help super shine that water. Also the extra tds meter to know what condition you silica busters in

 

[AZDesertRat]

Forget the inline TDS meters and get a good ATC compensated handheld, it is more versatile, more accurate and can be used anywhere, not just a dedicated point.

 

[thehammer1985]

I will agree while handheld are more precise is it worth the extra inconvenience for the 0.01 ppb? Also yes it is more versatile however there are large margins for error in these units because users do not properly clean the testing container appropriately . Also 99.9 percent of the time he is more than likely only going to utilize this to determine if his water is 0 going into a storage tank so the versatility is wasted

 

[thehammer1985]

The hm inline and hm handheld both state they read +/- 2%

 

[AZDesertRat]

The inlines are not truly temperature comensated s have built in inaccuracies. If you look at the IN and OUT probes you will see a fat part with a little rectangular hole or window cut in them. The temp probe is inside this hole so the probes read air temperature and not water temperature. If your water and air are not exactly the same you can have huge differences. The AP-1, TDS-3 and TDS-4TM, all in the same $25-$30 price range, are ATC compensated and the probe sticks in the water. You can test not only the finished water but you should also be testing your tap water, ATO storage and much more. I have two dual inlines and never even turn them on anymore, they never agree with my COM-100 or AP-1.

TDS meters don't read down to 0.01 ppb, most read in whole numbers (there are no decimals)down to 1 ppm, many many times less sensitve than ppb. The COM-100 does read in tenths so has one decimal place but costs about twice as much at $60.
Also keep in mind, that 2% accuracy is 2% of full scale, so can be significant.

I have advised thousands on how to properly test TDS and how to triple rinse the meter and glass or container between readings and before putting them away, no complaints from any of them yet.

 

[thehammer1985]

Those ppb and decimals where over exaggerations for purpose . Ya you can test ur tap with the handheld. But you can also test it with an inline. As far as The whole goes reading ambient temperature I would not be to concern with this as there is no exhaust hole so air flow would be minimal at best most likely stagnant and the current air that is inside will conduct the temperature of the PVC and the PVC will conduct the temperature of the water. Now if I was blowing a fan at this or even drill the hole opposite of the initial hole I would tend to be more concerned. And at this rate if your are arguing about a couple percentage thenwe should just suggest that everybody out there goes and buys a meter such as an octan. I have to hand held meters and of course I have an inline meter I never allow my DI resin to achieve more than one part per million which most Reefer strive for on any reading hence at 2% this shouldn't even be of concern.

 

[thehammer1985]

Also when you speak of complaint I would like to see a statistical analysis of any member who keep sturdier resin as 0 with an inline TDS meter and ask if there are any complaints

 

[AZDesertRat]

? What you said makes no sense. If you are asking if 0 TDS is actually 0 TDS then no it may not be. The readings are only as good as the meter and the testing methodology. One problem is many people have only ever been exposed to an inline meter so do not know any different. Someone like myself who works in the water industry and has access to instruments and RO or RO/DI system and am able to test and run things side by side so the drawbacks become very apparent. I brought a Thornton benchtop conductivity/resistivity meter home and compared the readings to all three of my handhelds and both of my dual inlines so have personal experience with their inaccuracies. I have also seen inline probes cut apart an analyzed so its not a bunch of bull. Same with RO/DI systems from at least 6 different vendors and many many brands and blends of DI resins, the quality is all over the place and if I had not had the opportunity to test it myself I might have been perfectly happy with my old AWI Typhoon III or Watts Premier systems.
There really is a difference and it pays to research before buying.

 

[thehammer1985]

That's a cool story . But for all intensive purposes without analytical data I'm not buying into it. And I can hold my own convictions. When we are talking about reef systems and ppm true if I had 1000ppm 2% would be a huge it could be 1020 . But 1 ppm even 10 u r looking at 1.02 and 10.2 . These are so miniscule that they should not be orlf concern. If it was all one element I would agree however this could be made up of 100 different molecules so there is no great build up of any amount

 

[WindeyD]

I use a BRS 6 stage water saver plus and am very satisfied with it.

 

[AZDesertRat]

2% of full scale on a meter that reads up to 999 is 20, not .02 or .2. It seems you don't understand meters and how they work. Research.

 

[TaylorPilot]

Interesting discussion. So when looking at a meter, you can't just look at the accuracy, but the overall range? Which one would you suggest on a budget ($30), and what would you recommend for good quality ($60-$100). +-20 PPM isn't worth a dang when were trying to measure in 1-2.

I'm looking at the meters, and looking at the standard 2 probe inline meter everyone sells, it says 0-999ppm with +-2% deviation.

http://www.marinedepot.com/ps_viewi...mJ_vZUgEv2NVPKkMGVa5Bfw_iGtmXkROEWBoC3aTw_wcB

But looking at the COM-100 you mentioned shows a range of 0-8560ppm with a deviation of +-2%. So wouldn't it be over 8 times the deviation? I must be missing something.

http://www.tdsmeter.com/products/com100.html

@AZDesertRat which unit do you use for daily use. I had never thought about it, but just using valves at every stage, you can use 1 meter and test anywhere you want.

 

[AZDesertRat]

The COM-100 is more sensitive and much more accurate since it can not only read down to tenths of a PPM but you can also switch it to work as a conductivity meter too. It is temperature compensated and the temp prob eis immersed in the water unlike the inlines which are not. I use the COM-100 as my go to meter with an AP-1 as a back up which replaced a TDS-4TM which I sold along with an old RO/DI system I had. All are much better choices than inlines. As you mentioned, I do have a tee and valve between each stage so I can monitor my RO/DI at each step of the process, this is especially important if you have dual DI and for calculating the rejection rate of the membrane.

 

[d2mini]

I've been running a 5 stage reef system from The Filter Guys for 5-6 years or so.
Fair prices, great service, quality equipment.

 

[ReeferEric]

I've used Air, Water & Ice, SpectraPure, Seachem, BRS and a few others. Ended up with the BRS unit and can honestly say they are all the same. Just added a few gadgets here and there.

@AZDesertRat has given me great advice over the years.

Aqua FX is a good brand too, they supplied all the freshwater for Macna this year when I spoke to them. No pumps used, simple city water pressure kept up.

 

[TaylorPilot]

The COM-100 is more sensitive and much more accurate since it can not only read down to tenths of a PPM but you can also switch it to work as a conductivity meter too. It is temperature compensated and the temp prob eis immersed in the water unlike the inlines which are not. I use the COM-100 as my go to meter with an AP-1 as a back up which replaced a TDS-4TM which I sold along with an old RO/DI system I had. All are much better choices than inlines. As you mentioned, I do have a tee and valve between each stage so I can monitor my RO/DI at each step of the process, this is especially important if you have dual DI and for calculating the rejection rate of the membrane.

Yea, I saw that it has 3 level of auto switching. I guess it has three different levels of sensitivity. Kind of like how multi meters can scale to milliamps or just amps.