MonsterReef
Well-Known Member
My tds meter is reading 007 ppm for ro/di water and 390 ppm for tank water is this good or bad
Tds meter good or bad
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Fudsey
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Salt affects TDS readings if I am not mistaken
pickupman66
5000 Club Member
dont measure your tank for TDS. doesnt tell you much. 7ppm TDS on your top off water means time to change the DI resin and or membrane.
OP
OP
MonsterReef
Well-Known Member
Membrane is 2 weeks old
If you have tested saltwater with your TDS meter you have contaminated the meter. Get a gallon jug of distilled water and soak the meter probes in it for awhile then change the distilled water and do it again several times to get the gunk off the meter.
Most TDS meters register up to 999, new saltwater is going to be somewhere over 32,000 so many times higher than the meter is designed to test. Clean it up with the distilled water until it reads 0 TDS in distilled then using your squeaky clean glass you soaked it in test your tap water TDS. Draw a glass of tap, stick the meter in and wait for the reading to stabilize, write it down and triple rinse the glass and meter in distilled or RO/DI water. Next draw a glass of RO only water before the DI, again let the reading stabilize, write it down and triple rinse again. Finally get a final RO/DI sample directly from the DI, insert the meter, let it stabilize, write it down, do a final triple rinse and put the glass away upside down do it stays clean and make sure the meter is capped.
What are the three TDS readings?
Most TDS meters register up to 999, new saltwater is going to be somewhere over 32,000 so many times higher than the meter is designed to test. Clean it up with the distilled water until it reads 0 TDS in distilled then using your squeaky clean glass you soaked it in test your tap water TDS. Draw a glass of tap, stick the meter in and wait for the reading to stabilize, write it down and triple rinse the glass and meter in distilled or RO/DI water. Next draw a glass of RO only water before the DI, again let the reading stabilize, write it down and triple rinse again. Finally get a final RO/DI sample directly from the DI, insert the meter, let it stabilize, write it down, do a final triple rinse and put the glass away upside down do it stays clean and make sure the meter is capped.
What are the three TDS readings?
