Time to change RO/DI filters?

dtaranath · 09/26/2006, 12:40 PM

Raw water: 316ppm
RO only: 096ppm
RO/DI: 006ppm

I'm using Typhoon III. Is it time for me to change filters? I've only been using it since early July. I use DI Bypass and Fast Flush before every use. It's made about 300-400 gallons so far.

If I have to change filters, do I have to change all of them? Or just the DI resin?

cybertec69 · 09/26/2006, 01:34 PM

time for some resin change "looks to be exuasted", the other filters should be fine, maybe the sediment filter also, see how it looks, if it is brown, change it also, my Raw waters PPM is 34-35, wow you have some high PPM city water.

dtaranath · 09/26/2006, 08:06 PM

ah, thanks. the sediment filter is getting brown, but still some areas of white can be seen. Should I still change it?

AZDesertRat · 09/26/2006, 08:32 PM

You need to review those numbers again. Do you mean the RO only is 9.6 or 96? If its 96 you have big problems, you should only be seeing about 6 or 7 from the RO only. At that rate your DI should last about 300 to 400 gallons before you start to see an rise in TDS above 1 or 2. I would recheck the RO again using a squeaky clean water glass and triple rinse it in DI before and after use. If you are sending out a RO only TDS of 96 you will only get about 32 gallons out of a new DI cartridge.

Sediment and carbon fliters should be changed every 6 months unless you have really high sediment then it may need them more often than that. RO membranes should last 3+ years and DI should treat approx 3000 total TDS, so if your RO output is 9.6 TDS you would get 312.5 gallons of good water per DI. The DI is not a scientific formula but its darn close based on bench and field testing results.

BTW, the average TDS nationwide is about 250 so your water is not that bad. Mine is 735 TDS.

Thefilterguys · 09/27/2006, 10:36 AM

Your readings are unclear but without a doubt your DI resin looks to be exhausted once you start to see a TDS reading it time to change. With a RO reading of 10 and you are running a stright DI cartridge you should get about 600 gallons of production water if it is a layered silica/DI you will only get 400. Everyones municipal water veries so production can also be higher or lower which may account for the difference between AZ and I. Your sediment and carbons should still be good after three months.

Jim

crumbletop · 09/27/2006, 10:49 AM

Quote:

Originally posted by AZDesertRat
You need to review those numbers again. Do you mean the RO only is 9.6 or 96? If its 96 you have big problems, you should only be seeing about 6 or 7 from the RO only.

Yeah, recheck those numbers. Have the post RO numbers always been like that? If the numbers are accurate, I'd contact Walter at AWI as you have an issue with your membrane. He may be able to send you a replacement and some replacement DI resin, as this shouldn't happen in a new unit.

Thefilterguys · 09/27/2006, 12:15 PM

crumbletop I'm betting on his readings are the problem not his membrane. If the RO reading is 9 and he has a 75 GPD membrane that would be a 97% rejection rate. If the RO reading was 96 his DI production water reading would also be sky high after 60-70 gallons of production water.

Jim

dtaranath · 09/27/2006, 09:43 PM

well, the RO was definitely 96. I'll recheck it again with a squeaky clean glass. also, i have a 75gpd membrane.

Thefilterguys · 09/27/2006, 11:27 PM

Well then I guess I was wrong in assuming sounds like your membrane is toast and you need to contact AWI.

Jim

09/26/2006, 12:40 PM	#1
dtaranath Premium Member Join Date: Sep 2005 Location: Reading, PA Posts: 542	Time to change RO/DI filters? Raw water: 316ppm RO only: 096ppm RO/DI: 006ppm I'm using Typhoon III. Is it time for me to change filters? I've only been using it since early July. I use DI Bypass and Fast Flush before every use. It's made about 300-400 gallons so far. If I have to change filters, do I have to change all of them? Or just the DI resin?

09/26/2006, 01:34 PM	#2
cybertec69 Registered Member Join Date: Sep 2006 Location: Staten Island, NY Posts: 315	time for some resin change "looks to be exuasted", the other filters should be fine, maybe the sediment filter also, see how it looks, if it is brown, change it also, my Raw waters PPM is 34-35, wow you have some high PPM city water. __________________ 120gal Mixed reef Lifereef sump LF1-125 and Skimmer VS-36 CPR Hang-On Refugium FB300 Fluidized Bed Filter Sunlight Supply MH+T5's AquaFX Baracuda 4 Stage RO/DI SeaChill by Teco TR20- 1/3 Chiller Current Tank Info: 125 Gal Mixed Reef

09/26/2006, 08:06 PM	#3
dtaranath Premium Member Join Date: Sep 2005 Location: Reading, PA Posts: 542	ah, thanks. the sediment filter is getting brown, but still some areas of white can be seen. Should I still change it? __________________ ______________________ 220g mixed reef

09/27/2006, 10:36 AM	#5
Thefilterguys RC Sponsor Join Date: Aug 2006 Location: Duluth, Mn Posts: 553	Your readings are unclear but without a doubt your DI resin looks to be exhausted once you start to see a TDS reading it time to change. With a RO reading of 10 and you are running a stright DI cartridge you should get about 600 gallons of production water if it is a layered silica/DI you will only get 400. Everyones municipal water veries so production can also be higher or lower which may account for the difference between AZ and I. Your sediment and carbons should still be good after three months. Jim __________________ RO/DI Supplies & parts www.thefilterguys.biz We Custom Build Each System Phone 218 724-8000 Current Tank Info: 40 OCEANIC STRETCH HEX FRESH HEAVY PLANTED, 58 OCEANIC LPS, Monti’s ,Softy’s, 18 Nano Zoo’s , 11 Nano, 70 OCEANIC SPS New 200 Cube on the way

09/27/2006, 12:15 PM	#7
Thefilterguys RC Sponsor Join Date: Aug 2006 Location: Duluth, Mn Posts: 553	crumbletop I'm betting on his readings are the problem not his membrane. If the RO reading is 9 and he has a 75 GPD membrane that would be a 97% rejection rate. If the RO reading was 96 his DI production water reading would also be sky high after 60-70 gallons of production water. Jim __________________ RO/DI Supplies & parts www.thefilterguys.biz We Custom Build Each System Phone 218 724-8000 Current Tank Info: 40 OCEANIC STRETCH HEX FRESH HEAVY PLANTED, 58 OCEANIC LPS, Monti’s ,Softy’s, 18 Nano Zoo’s , 11 Nano, 70 OCEANIC SPS New 200 Cube on the way

09/26/2006, 08:32 PM	#4
AZDesertRat Moved On Join Date: Jan 2002 Location: NW Phoenix Posts: 16,621	You need to review those numbers again. Do you mean the RO only is 9.6 or 96? If its 96 you have big problems, you should only be seeing about 6 or 7 from the RO only. At that rate your DI should last about 300 to 400 gallons before you start to see an rise in TDS above 1 or 2. I would recheck the RO again using a squeaky clean water glass and triple rinse it in DI before and after use. If you are sending out a RO only TDS of 96 you will only get about 32 gallons out of a new DI cartridge. Sediment and carbon fliters should be changed every 6 months unless you have really high sediment then it may need them more often than that. RO membranes should last 3+ years and DI should treat approx 3000 total TDS, so if your RO output is 9.6 TDS you would get 312.5 gallons of good water per DI. The DI is not a scientific formula but its darn close based on bench and field testing results. BTW, the average TDS nationwide is about 250 so your water is not that bad. Mine is 735 TDS.

09/27/2006, 09:43 PM	#8
dtaranath Premium Member Join Date: Sep 2005 Location: Reading, PA Posts: 542	well, the RO was definitely 96. I'll recheck it again with a squeaky clean glass. also, i have a 75gpd membrane. __________________ ______________________ 220g mixed reef

09/27/2006, 11:27 PM	#9
Thefilterguys RC Sponsor Join Date: Aug 2006 Location: Duluth, Mn Posts: 553	Well then I guess I was wrong in assuming sounds like your membrane is toast and you need to contact AWI. Jim __________________ RO/DI Supplies & parts www.thefilterguys.biz We Custom Build Each System Phone 218 724-8000 Current Tank Info: 40 OCEANIC STRETCH HEX FRESH HEAVY PLANTED, 58 OCEANIC LPS, Monti’s ,Softy’s, 18 Nano Zoo’s , 11 Nano, 70 OCEANIC SPS New 200 Cube on the way