Are my Ro/Di filters shot?

kdc527 · 08/18/2009, 02:29 PM

I got a filter guys ro/di system for Christmas. Set it up in january just changed di cartridge got 000ppm but a week went by and now I am getting 001ppm. Are my ro filters shot? If so I used to have city water now I have well water due to a move to a house. Are there different filters i sould run then? THANKS

KillerReef · 08/18/2009, 02:34 PM

I don't think I would worry about 001 ppm. How are you testing the water?

kdc527 · 08/18/2009, 02:36 PM

inline tds meter

Toddrtrex · 08/18/2009, 02:48 PM

Have you change your Pre-filter and Carbon?

To figure out if your RO membrane is shot you will need to know the TDS of your tap, and then the TDS of the post RO (( but before the DI )). If that rejection rate is worse then the stated rate for your membrane, it is time to replace it.

An example using a DOW filmtec 75 GPD RO membrane (( which has a 96-98% rejection rate )).
If your tap's TDS is 100, and the post RO TDS is higher then 5 I would order a new one.

Sisterlimonpot · 08/18/2009, 02:49 PM

.001 is good, what is the TDS before the DI resin (after the RO membrane)?

badwrasse · 08/18/2009, 02:52 PM

get a hand held tds too, to check against eachother.
You will have to change your filters more with well water espesialy the prefilter and DI. is that reading 00.1 or 0.01 or 001. or .001?
Even if its 1.0 its not a problem just curious.
Also run about a gal through it before you take a reading or make water for the tank, it will be a little lower.
also make sure that what ever the water is in is sterile I use a sandwich bag to hold the water inside a cup to hold the bag. try these and report back your findings

08/18/2009, 02:29 PM	#1
kdc527 Registered Member Join Date: Nov 2007 Location: Boyertown, PA Posts: 333	Are my Ro/Di filters shot? I got a filter guys ro/di system for Christmas. Set it up in january just changed di cartridge got 000ppm but a week went by and now I am getting 001ppm. Are my ro filters shot? If so I used to have city water now I have well water due to a move to a house. Are there different filters i sould run then? THANKS __________________ she thinks the fish are pretty Current Tank Info: 55 gallon reef 29 gallon sump 2 korlia 2's mag5 return current 48"pc light

08/18/2009, 02:34 PM	#2
KillerReef Wrasse-a-holic Join Date: Dec 2001 Location: So Cal Posts: 2,083	I don't think I would worry about 001 ppm. How are you testing the water? __________________ 80 gallon Jebo 48x18x21 Bubble Magus BM-180 Cone 110lbs Live Rock 1-2" Sandbed Mag 12 Return Pump 2 MP10s, One Left Rear, One Right front Opposite each Other 2x65w pc 03 Actinic 2 250W Lumatek w/ SE Phoenix MH about 4" above water Livestock: 10 yr. old Purple Tang, Orchid Dottyback, Melanurus Wrasse, Pink Margin Wrasse, Pair of Clowns, Bartlett Anthias, Diamond Goby, 18 yr. old Lemon Peel Angel, Blue Flasher Wrasse Mixed Reef, mostly Zoanthids

08/18/2009, 02:36 PM	#3
kdc527 Registered Member Join Date: Nov 2007 Location: Boyertown, PA Posts: 333	inline tds meter __________________ she thinks the fish are pretty Current Tank Info: 55 gallon reef 29 gallon sump 2 korlia 2's mag5 return current 48"pc light

08/18/2009, 02:48 PM	#4
Toddrtrex Registered Member Join Date: Feb 2004 Location: Carol Stream, IL Posts: 23,162	Have you change your Pre-filter and Carbon? To figure out if your RO membrane is shot you will need to know the TDS of your tap, and then the TDS of the post RO (( but before the DI )). If that rejection rate is worse then the stated rate for your membrane, it is time to replace it. An example using a DOW filmtec 75 GPD RO membrane (( which has a 96-98% rejection rate )). If your tap's TDS is 100, and the post RO TDS is higher then 5 I would order a new one. __________________ Click my name and then "visit toddrtrex's homepage" for tank pictures Current Tank Info: 210g reef and 65g reef

08/18/2009, 02:49 PM	#5
Sisterlimonpot R.C. Fraternity President Join Date: Dec 2008 Location: Litchfeild Park AZ Posts: 11,490 Blog Entries: 2	.001 is good, what is the TDS before the DI resin (after the RO membrane)? __________________ Jimmy MASVC President Dishes are done man! Current Tank Info: 300 in progress

08/18/2009, 02:52 PM	#6
badwrasse Registered Member Join Date: May 2009 Location: St. louis Posts: 1,203	get a hand held tds too, to check against eachother. You will have to change your filters more with well water espesialy the prefilter and DI. is that reading 00.1 or 0.01 or 001. or .001? Even if its 1.0 its not a problem just curious. Also run about a gal through it before you take a reading or make water for the tank, it will be a little lower. also make sure that what ever the water is in is sterile I use a sandwich bag to hold the water inside a cup to hold the bag. try these and report back your findings __________________ GOT CRABS? Current Tank Info: 90gal RR,rock wall in progress, MRC sump, reef octopus XP2000I skimmer, marineland pro lighting 2-150w MH 4-54w T5's, hydor wavemaker with 2 #4 controllable pumps, and QuietOne 4000HH return pump.