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Tap water PPM?
- Thread starter GTL_UK
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Andy Thurston
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Definitely possible low TDS tap water in certain areas of the uk
My tap is between 60-70 ppm and I've read a few posts recently where members TDS is around 45ppmm from the tap.
My tank is around 150 after weekly water change and between 200-220 just before
My tap is between 60-70 ppm and I've read a few posts recently where members TDS is around 45ppmm from the tap.
My tank is around 150 after weekly water change and between 200-220 just before
X3NiTH
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Entirely normal.
Generally Tank water TDS is higher because of all the biological processes in the tank that add to it. The tap TDS is low but not zero, you won't ever get zero out the tap because the pH will eat copper pipe, buffers are added to bring the pH above 7, this adds TDS, chlorine may be added and chloramine also to make the water safe to drink, this will also add TDS, mineral content (measured as GH and KH) are likely low but will constitute some part of the TDS.
My tap TDS is 30-40, municipal supply fed by reservoir caught rainwater coming of the hills.
Generally Tank water TDS is higher because of all the biological processes in the tank that add to it. The tap TDS is low but not zero, you won't ever get zero out the tap because the pH will eat copper pipe, buffers are added to bring the pH above 7, this adds TDS, chlorine may be added and chloramine also to make the water safe to drink, this will also add TDS, mineral content (measured as GH and KH) are likely low but will constitute some part of the TDS.
My tap TDS is 30-40, municipal supply fed by reservoir caught rainwater coming of the hills.
Andy Thurston
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It should come with a calibration certificate what ppm it was calibrated to. It should be calibrated with the ppm that is closest to the range you are measuring
X3NiTH
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More than likely its factory calibrated and there is no need.
You have a baseline already in that your tap TDS is 30 (you can compare this figure with your local water authority report to see if it's in the right ballpark) and tank at 220, so as expected it has measured a difference between the samples, the tap TDS is unlikely to ever be much lower than 30 so you know it's not giving you a wildly inaccurate higher value.
You have a baseline already in that your tap TDS is 30 (you can compare this figure with your local water authority report to see if it's in the right ballpark) and tank at 220, so as expected it has measured a difference between the samples, the tap TDS is unlikely to ever be much lower than 30 so you know it's not giving you a wildly inaccurate higher value.
Andy Thurston
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Andy Thurston
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That was the only one i could find.
I wonder if its possible to use de ionised water with 0ppm or if you would need at least some ppm to calibrate accurately
Andy Thurston
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90
Get your tds calibration solution.
Pour enough into a cup to dip your pen in. Turn on pen . Leave pen in solution for 5 minutes and calibrate ( with a small screwdriver) the LCD display to read the correct value.
In your case 90 ppm.
Or whatever ppm your calibration solution is.
