?? regarding spectrapure 90gpd maxcap

jkdavids121507 · 03/07/2015, 10:27 PM

I recently bought a used rodi unit. To be safe, I replaced the mambrane, pre filter, carbon filter and di resin in the first di cartridge. I did not replace the contents of the last cartridge because I was told it still looked good. After hooking it up and running it for a while, I get a TDS reading of 0 from the first di cartridge to the silica cartridge. My TDS reading from the silica cartridge out is then reading 001. What could cause this?

tkeracer619 · 03/07/2015, 10:42 PM

It is likely exhausted.

jkdavids121507 · 03/07/2015, 10:46 PM

Would it actually cause my TDS reading to increase after coming through the di cartridge?

If it needs to be replaced, what is actually in it? Can you purchase just the resin or do you have to buy the entire cartridge?

tkeracer619 · 03/07/2015, 11:00 PM

Yes, if exhausted the numbers can rise above the input number.

Sure, you can replace the di itself with a mixed bed DI. I tend not to buy bulk DI anymore because it goes bad as it ages. I like using fresh cartridges.

If you have two DI stages the 2nd stage can last a really long time.

azjohnny · 03/08/2015, 07:27 AM

I usually have to change out the 2nd DI every 3rd time I change out the 1st

#1 - Maxcap DI
#2 - Silica Buster DI

jkdavids121507 · 03/08/2015, 08:10 AM

What is the difference between the two?

Tweaked · 03/08/2015, 08:16 AM

Quote:

Originally Posted by azjohnny

I usually have to change out the 2nd DI every 3rd time I change out the 1st

#1 - Maxcap DI
#2 - Silica Buster DI

This is their recomendation as well.

azjohnny · 03/08/2015, 12:15 PM

The Maxcap and Silica Buster use different media.

this link goes in depth
http://reefcentral.com/forums/showthread.php?t=1839653

03/07/2015, 11:00 PM	#4
tkeracer619 Registered Member Join Date: Jan 2006 Location: Westminster, CO Posts: 17,289	Yes, if exhausted the numbers can rise above the input number. Sure, you can replace the di itself with a mixed bed DI. I tend not to buy bulk DI anymore because it goes bad as it ages. I like using fresh cartridges. If you have two DI stages the 2nd stage can last a really long time. __________________ 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.

03/07/2015, 10:27 PM	#1
jkdavids121507 Registered Member Join Date: Jul 2014 Posts: 85	?? regarding spectrapure 90gpd maxcap I recently bought a used rodi unit. To be safe, I replaced the mambrane, pre filter, carbon filter and di resin in the first di cartridge. I did not replace the contents of the last cartridge because I was told it still looked good. After hooking it up and running it for a while, I get a TDS reading of 0 from the first di cartridge to the silica cartridge. My TDS reading from the silica cartridge out is then reading 001. What could cause this?

03/07/2015, 10:42 PM	#2
tkeracer619 Registered Member Join Date: Jan 2006 Location: Westminster, CO Posts: 17,289	It is likely exhausted. __________________ 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.

03/07/2015, 10:46 PM	#3
jkdavids121507 Registered Member Join Date: Jul 2014 Posts: 85	Would it actually cause my TDS reading to increase after coming through the di cartridge? If it needs to be replaced, what is actually in it? Can you purchase just the resin or do you have to buy the entire cartridge?

03/08/2015, 07:27 AM	#5
azjohnny Registered Member Join Date: Apr 2012 Location: Gold Canyon Posts: 2,914	I usually have to change out the 2nd DI every 3rd time I change out the 1st #1 - Maxcap DI #2 - Silica Buster DI

03/08/2015, 08:10 AM	#6
jkdavids121507 Registered Member Join Date: Jul 2014 Posts: 85	What is the difference between the two?

03/08/2015, 12:15 PM	#8
azjohnny Registered Member Join Date: Apr 2012 Location: Gold Canyon Posts: 2,914	The Maxcap and Silica Buster use different media. this link goes in depth http://reefcentral.com/forums/showthread.php?t=1839653