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03/19/2014, 01:28 PM
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#1 |
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Registered Member
Join Date: Oct 2009
Location: Sacramento CA
Posts: 2,426
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my rodi is reading 3 tds, what to change?
hey all-
my rodi is water is reaidn 3 tds, what filter in my system do i need to change? all of them or just one? which? thanks
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No Tanks... I'm out! still lurking, though... |
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03/19/2014, 01:37 PM
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#2 |
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Registered Member
Join Date: Jan 2014
Posts: 431
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Do you have a DI cartridge on your setup? If so, is it bicolored (more like different shades of brown than a different color). If I had to guess and blindly replace something it'd be the DI resin. BRS has good prices. Also check out the nifty inexpensive dual-probe monitor that will let you check TDS after RO and sediment cartridges but before deionization, and the other checks the final product after DI. Must have for a RO unit, IMO. Can save you money by preventing premature cartridge/resin/membrane replacement - and extra $'s on late replacement when you're fighting phosphates, nitrates and metals in your tank.
http://www.bulkreefsupply.com/dual-i...m-digital.html 3 TDS is not that high. What's your raw tap water test at? Last edited by garyinco; 03/19/2014 at 01:43 PM. |
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03/19/2014, 01:44 PM
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#3 |
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Registered Member
Join Date: Oct 2009
Location: Sacramento CA
Posts: 2,426
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i'll check it out when i get home...
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No Tanks... I'm out! still lurking, though... |
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03/19/2014, 01:52 PM
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#4 |
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Registered Member
Join Date: Jan 2004
Location: East Coast/West Coast
Posts: 4,887
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Check your output before DI and after DI. That will tell you if your prefilters / membrane need to be changed or your DI.
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- John *blackthunda stands for a black Mistubishi 3000GT with black rims I used to own. Don't get any funny ideas! Current Tank Info: 200 Gal custom tank with dual corner overflows, 80 gal custom sump/refugium, Neptune Apex controller, Dual Lumenmax Elite reflectors with 250 Radiums, SWC 160 Cone Skimmer, 2x Jebao WP-25....and some other stuff. |
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03/21/2014, 09:20 AM
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#5 |
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Registered Member
Join Date: Oct 2009
Location: Sacramento CA
Posts: 2,426
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bumping this...
the output after the membranes is 4 tds. the sediment filter is brown, ordered a replacement. there is no di resin cannister, so i ordered a canister. when i get it, i assume the di goes online after the membranes? never really paid much attention to it and ive been doing this for over 5 years...
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No Tanks... I'm out! still lurking, though... |
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03/21/2014, 09:25 AM
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#6 |
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Registered Member
Join Date: Jan 2004
Location: East Coast/West Coast
Posts: 4,887
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Most people running these units do indeed have a low tds reading after the membranes. For example, i have 2-3tds after the membrane. The Di will polish off the rest giving you 0tds. 4 tds is not bad after the sediment filters and membrane. The DI resin cannister will bring it down to 0 no problem. The higher your TDS is before the resin the more frequently youll have to change the DI.
__________________
- John *blackthunda stands for a black Mistubishi 3000GT with black rims I used to own. Don't get any funny ideas! Current Tank Info: 200 Gal custom tank with dual corner overflows, 80 gal custom sump/refugium, Neptune Apex controller, Dual Lumenmax Elite reflectors with 250 Radiums, SWC 160 Cone Skimmer, 2x Jebao WP-25....and some other stuff. |
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