How much TDS do you allow?
- Thread starter scottsr
- Start date
HighlandReefer
Team RC
Re: How much TDS do you allow?
Randy discusses your question in this article:
Reverse Osmosis/Deionization Systems to Purify Tap Water for Reef Aquaria
http://reefkeeping.com/issues/2005-05/rhf/index.htm
From this article:
"Monitor the DI resins by measuring the effluent's conductivity, either with an inline meter (set to its most sensitive level), or by measuring the effluent manually. If you are using a TDS or conductivity meter, then the measured value should drop to near zero, or maybe 0-1 ppm TDS or 0-1 mS/cm. Higher values indicate that something is not functioning properly, or that the DI resin is becoming saturated and needs replacement. That does not necessarily mean, however, that 2 ppm TDS water is not OK to use. But beware that the flow of impurities and the conductivity may begin to rise fairly sharply when the resin becomes saturated. Do not agonize over 1 ppm versus zero ppm. While pure water has a TDS well below 1 ppm, uncertainties from carbon dioxide in the air (which gets into the water and ionizes to provide some conductivity; about 0.7 mS/cm for saturation with normal levels of CO2, possibly higher indoors) and the conductivity/TDS meter itself may yield results of 1 or 2 ppm even from totally pure water by not being exactly zeroed properly. Also note that the first impurities to leave the DI resin as it becomes saturated may be things that you are particularly concerned with (such as ammonia if your water supply uses chloramine or silica if there is a lot in the source water)."
Randy discusses your question in this article:
Reverse Osmosis/Deionization Systems to Purify Tap Water for Reef Aquaria
http://reefkeeping.com/issues/2005-05/rhf/index.htm
From this article:
"Monitor the DI resins by measuring the effluent's conductivity, either with an inline meter (set to its most sensitive level), or by measuring the effluent manually. If you are using a TDS or conductivity meter, then the measured value should drop to near zero, or maybe 0-1 ppm TDS or 0-1 mS/cm. Higher values indicate that something is not functioning properly, or that the DI resin is becoming saturated and needs replacement. That does not necessarily mean, however, that 2 ppm TDS water is not OK to use. But beware that the flow of impurities and the conductivity may begin to rise fairly sharply when the resin becomes saturated. Do not agonize over 1 ppm versus zero ppm. While pure water has a TDS well below 1 ppm, uncertainties from carbon dioxide in the air (which gets into the water and ionizes to provide some conductivity; about 0.7 mS/cm for saturation with normal levels of CO2, possibly higher indoors) and the conductivity/TDS meter itself may yield results of 1 or 2 ppm even from totally pure water by not being exactly zeroed properly. Also note that the first impurities to leave the DI resin as it becomes saturated may be things that you are particularly concerned with (such as ammonia if your water supply uses chloramine or silica if there is a lot in the source water)."
scubanoah24
New member
i dont change mine until it gets above the single digits.
The_Browns
New member
+1
Piranha_Owns
New member
Change mine at 3
ChrisKirkland
Reef and Coral Fanatic
I change the company's at 5 and mine at 5
I use 2 di canisters with a tds meter between them. When the first is 1ppm , I change the resin and rotate the second to the front of the line with the newly filled canister in the second position. This actually helps save resin since premature changes are avoided while the system is protected against post/di tds which can be more harmful than post ro tds.
Tranquility
New member
I use 4 stage DI first Is <0.1 PPM
I CHANGE Stage 1 and 2 when TDS come out from Stage 2 Is more then 3 PPM, and rotate stege 3-4 to 1-2. the TDS of DI it still below 0.5 PPM
TDS of RO/DI water Diatom grown significantly in my tank At 2 PPM
I CHANGE Stage 1 and 2 when TDS come out from Stage 2 Is more then 3 PPM, and rotate stege 3-4 to 1-2. the TDS of DI it still below 0.5 PPM
TDS of RO/DI water Diatom grown significantly in my tank At 2 PPM
Similar threads
