I need water purification options.

Globel · 06/18/2012, 08:39 PM

My tap water has extremely high tds, Its at 507 ppm. My membrane seems to be working properly I get about 23ppm on the out bound side. So i figure I am getting a 95% rejection rate. Now this is the first MONTH of my new ro/di system, and I think my DI resin is exhausted. Before, my di resin was able to knock down the 23 ppm water to 2 ppm. Now 30 days after install I am getting 23 on the outbound side of the DI. After inspecting the resin it seems only 25% has changed color. I have a 150 gallon tank and have used about 70-90 gallons of RO/DI water. At this rate the DI resin is going to be my largest expense for my aquarium. Do I have any other options?

sbeason · 06/19/2012, 05:37 AM

Is your DI resin filled to the top??? I mean no area for water to get past it. Fill it up more if thats the case. Do you have two DI resin cartridges? If not, I would seriously consider adding a 2nd one. I run two DI resin cartridges and do 30 gallon water changes per week and also top off around 20 gallons water per week on my 210 w/ 100g sump and the resin lasts for around 2~3 months before being exhausted. I change out my membrane once per year.

-Steve

sirreal63 · 06/19/2012, 08:47 AM

Are the DI chambers vertical or horizontal?

Globel · 06/19/2012, 10:12 AM

i am using the vertical BRS DI unit.

LittleBeard · 06/19/2012, 10:20 AM

Wow, that's a high TDS. Is it your own well or something? The EPA limits TDS at 500ppm, which your water would be over.

tkeracer619 · 06/19/2012, 11:21 AM

I would...

Increase pressure to membrane.
Reduce the ratio to maybe 6:1
Run dual non mixed bed resins and recharge them.

This should reduce the tds after RO and save some cash by regenerating the media.

Your membrane only has a 96% rejection rate. I would consider replacing it with a spectrapure that has been tested at 98%. My current membranes are running about 99%. If you hit 98% your di will last twice as long. 99% it should last roughly 4x as long.

The reason your color changing resin hasn't changed colors is because it is a general timer and not related the the actual tds removal capacity. My resin changes well in advance of needing it swapped out. My tds after membrane is 0-1.

06/18/2012, 08:39 PM	#1
Globel Registered Member Join Date: Nov 2003 Posts: 44	I need water purification options. My tap water has extremely high tds, Its at 507 ppm. My membrane seems to be working properly I get about 23ppm on the out bound side. So i figure I am getting a 95% rejection rate. Now this is the first MONTH of my new ro/di system, and I think my DI resin is exhausted. Before, my di resin was able to knock down the 23 ppm water to 2 ppm. Now 30 days after install I am getting 23 on the outbound side of the DI. After inspecting the resin it seems only 25% has changed color. I have a 150 gallon tank and have used about 70-90 gallons of RO/DI water. At this rate the DI resin is going to be my largest expense for my aquarium. Do I have any other options?

06/19/2012, 08:47 AM	#3
sirreal63 Go Spurs Go!!! Join Date: Dec 2004 Location: Meadowlakes Texas Posts: 13,357	Are the DI chambers vertical or horizontal? __________________ Jack No One has ever been seriously injured by using the search function. Alcohol, Tobacco and Firearms should be a convenience store, not a government agency. Current Tank Info: Reefing the Pentagon.

06/19/2012, 11:21 AM	#6
tkeracer619 Registered Member Join Date: Jan 2006 Location: Westminster, CO Posts: 17,289	I would... Increase pressure to membrane. Reduce the ratio to maybe 6:1 Run dual non mixed bed resins and recharge them. This should reduce the tds after RO and save some cash by regenerating the media. Your membrane only has a 96% rejection rate. I would consider replacing it with a spectrapure that has been tested at 98%. My current membranes are running about 99%. If you hit 98% your di will last twice as long. 99% it should last roughly 4x as long. The reason your color changing resin hasn't changed colors is because it is a general timer and not related the the actual tds removal capacity. My resin changes well in advance of needing it swapped out. My tds after membrane is 0-1. __________________ Hobby Experience: 9200ish gallons, 26 skimmers, and a handful of Kent Scrapers. Current Tank: Vortech Powered 600G SPS Tank w/ 100gal frag tank & 100g Sump. RK2-RK10 Skimmer. ReefAngel. Radium 20k.

06/19/2012, 05:37 AM	#2
sbeason Registered Member Join Date: Oct 2006 Location: Lake St Louis, MO Posts: 1,391	Is your DI resin filled to the top??? I mean no area for water to get past it. Fill it up more if thats the case. Do you have two DI resin cartridges? If not, I would seriously consider adding a 2nd one. I run two DI resin cartridges and do 30 gallon water changes per week and also top off around 20 gallons water per week on my 210 w/ 100g sump and the resin lasts for around 2~3 months before being exhausted. I change out my membrane once per year. -Steve

06/19/2012, 10:12 AM	#4
Globel Registered Member Join Date: Nov 2003 Posts: 44	i am using the vertical BRS DI unit.

06/19/2012, 10:20 AM	#5
LittleBeard Registered Member Join Date: Nov 2008 Location: FL Posts: 83	Wow, that's a high TDS. Is it your own well or something? The EPA limits TDS at 500ppm, which your water would be over.