Source of increasing tds?

70ss · 06/27/2006, 09:59 PM

I have a auto topoff set up. A 32 gal rubbermaid brute can. Which I fill with ro/di water 0 to 1 tds. inside I put a pump on a timer to run twice a day for 15 mins each time. Conected to pump is a 1/2 line run into a tee reducer 1/2 inlet two 1/4 outlets one going to float in sump other returning to can. Thought was water pressure would bypass float when full and return to tank. Now to problem I have had two pumps hooked up to this a quiet one 4000 and a submersible sump pump from harbor freight. Tds raises dailt in can with both. Have lid on top of can. Only thing in with water is pump and lines (electric,feed and return). Water went from 1 tds too 22 tds since yesterday. My question what is being dissolved in the water and if it is coming from pumps is it going to hurt anything? And if it coming from pump these are the same type (quiet one) I have been using only externaly for my return and skimmer.

Amphiprion · 06/27/2006, 10:01 PM

the first few seconds/minutes the RO tops off, you will have slightly less pure water, which would promote TDS creep. There is a way to remedy it by making some sort of little vessel (some new ATO do it for you, though, by wasting the first few minutes of RO).

70ss · 06/27/2006, 10:04 PM

The water is already in the can at 1tds no new water was added to the can it is now 22tds and will continue to rise daily.

Amphiprion · 06/27/2006, 10:07 PM

How much is evaporating from the container?

70ss · 06/27/2006, 10:12 PM

Couldnt honestly say but with the top on and being in the basement I would think very little if any. Lid has no condensation on it when removed.

Amphiprion · 06/27/2006, 10:13 PM

Hmm. You've stumped me. I would almost be concerned about the can leaching something, if that is the case. Have you recalibrated your TDS meter lately?

crustin · 06/27/2006, 10:22 PM

have you added any thing to the water?

70ss · 06/27/2006, 10:32 PM

Not since changing ro/di filters 4 to 6 weeks ago. I am stumped also thats why I went back to filling with a bucket and checking tds in can for a week tds climbed to 3 tds after a week. Replaced pump(quiet one) with sump pump and tds climbed to 90 after a week stayed 2 to 5 for for a few days and I figured it was the pump next thing I new it was 90 almost overnight. also thought I may have cross contaminated with saltwater from bucket. So I removed water rinsed with a few gallons of ro/di water refilled. Took original quiet one apart cleaned replaced ceramic shaft put back together and put into can and ran for 10 min until return water measured same as water in can 1tds.Put lid on and checkes this evening and it was 22tds.

06/27/2006, 09:59 PM	#1
70ss Registered Member Join Date: Jan 2006 Location: PA Posts: 86	Source of increasing tds? I have a auto topoff set up. A 32 gal rubbermaid brute can. Which I fill with ro/di water 0 to 1 tds. inside I put a pump on a timer to run twice a day for 15 mins each time. Conected to pump is a 1/2 line run into a tee reducer 1/2 inlet two 1/4 outlets one going to float in sump other returning to can. Thought was water pressure would bypass float when full and return to tank. Now to problem I have had two pumps hooked up to this a quiet one 4000 and a submersible sump pump from harbor freight. Tds raises dailt in can with both. Have lid on top of can. Only thing in with water is pump and lines (electric,feed and return). Water went from 1 tds too 22 tds since yesterday. My question what is being dissolved in the water and if it is coming from pumps is it going to hurt anything? And if it coming from pump these are the same type (quiet one) I have been using only externaly for my return and skimmer.

06/27/2006, 10:01 PM	#2
Amphiprion Premium Member Join Date: Jul 2005 Location: Mobile, AL Posts: 6,611	the first few seconds/minutes the RO tops off, you will have slightly less pure water, which would promote TDS creep. There is a way to remedy it by making some sort of little vessel (some new ATO do it for you, though, by wasting the first few minutes of RO). __________________ You've done it now, haven't you? Current Tank Info: 40g breeder patch reef w/ seagrass; 2-250w XM 10K; Vortech MP40wES & MP10wES; BM Curve 7 skimmer; carbon & occasional GFO

06/27/2006, 10:07 PM	#4
Amphiprion Premium Member Join Date: Jul 2005 Location: Mobile, AL Posts: 6,611	How much is evaporating from the container? __________________ You've done it now, haven't you? Current Tank Info: 40g breeder patch reef w/ seagrass; 2-250w XM 10K; Vortech MP40wES & MP10wES; BM Curve 7 skimmer; carbon & occasional GFO

06/27/2006, 10:13 PM	#6
Amphiprion Premium Member Join Date: Jul 2005 Location: Mobile, AL Posts: 6,611	Hmm. You've stumped me. I would almost be concerned about the can leaching something, if that is the case. Have you recalibrated your TDS meter lately? __________________ You've done it now, haven't you? Current Tank Info: 40g breeder patch reef w/ seagrass; 2-250w XM 10K; Vortech MP40wES & MP10wES; BM Curve 7 skimmer; carbon & occasional GFO

06/27/2006, 10:22 PM	#7
crustin Registered Member Join Date: Aug 2003 Location: ga. Posts: 470	have you added any thing to the water? __________________ never give up Current Tank Info: 90g semi- reef

06/27/2006, 10:04 PM	#3
70ss Registered Member Join Date: Jan 2006 Location: PA Posts: 86	The water is already in the can at 1tds no new water was added to the can it is now 22tds and will continue to rise daily.

06/27/2006, 10:12 PM	#5
70ss Registered Member Join Date: Jan 2006 Location: PA Posts: 86	Couldnt honestly say but with the top on and being in the basement I would think very little if any. Lid has no condensation on it when removed.

06/27/2006, 10:32 PM	#8
70ss Registered Member Join Date: Jan 2006 Location: PA Posts: 86	Not since changing ro/di filters 4 to 6 weeks ago. I am stumped also thats why I went back to filling with a bucket and checking tds in can for a week tds climbed to 3 tds after a week. Replaced pump(quiet one) with sump pump and tds climbed to 90 after a week stayed 2 to 5 for for a few days and I figured it was the pump next thing I new it was 90 almost overnight. also thought I may have cross contaminated with saltwater from bucket. So I removed water rinsed with a few gallons of ro/di water refilled. Took original quiet one apart cleaned replaced ceramic shaft put back together and put into can and ran for 10 min until return water measured same as water in can 1tds.Put lid on and checkes this evening and it was 22tds.