TDS, mg/L, ppm, GH, HELP ME!!!!
Posted: Mon Jan 15, 2007 2:44 pm
Hi all,
I have a new TDS meter that measure in ppm. up till now i have measured GH with a titration test kit which always comes out at moderatley to very soft water. However i have started using the TDS meter and its comming out with results that seem unbelievebly hard.
Before i always had a reading of 80-120 mg/L which is soft ( i still get that reading with the GH test kit) the TDS meter however gives a reading of 947ppm in my comunity tank and 586ppm in my breeding tank. I have been doing loads of research on the net this morning as to what these values mean and how to convert them etc but as far as i can work out
1ppm=1mg/L, which would put my water at liquid rock!! (lake malawi)
other converisons i have found are
1 ppm = 1 mg/L CaCO3
1 ppm = 0.058 grains/US gallon
1 ppm = 0.07 Clark degrees
1 ppm = 0.10 French degrees
1 ppm = 0.056 German degrees
1 French degree = 1 hydrotimetric degree
1 Clark degree = 1 grain / Imperial gallon as calcium carbonate
1 French degree = 1 part / 100,000 calcium carbonate
1 German degree = 1 part / 100,000 calcium oxide
1 grain/US gallon = 17.1 ppm
1 grain/US gallon = 1.20 Clark degrees
1 grain/US gallon = 1.71 French degrees
1 grain/US gallon = 0.958 German degrees
But depending which calculation i do depends how hard my water gets.........im either crap at maths or am missng some information.
Can anyone provide any help regarding, how do i convert my ppm figure to a workable value, ie is 586ppm soft or hard?, how do i convert it to GH? and the meaning of life?
Thanks
Andy
I have a new TDS meter that measure in ppm. up till now i have measured GH with a titration test kit which always comes out at moderatley to very soft water. However i have started using the TDS meter and its comming out with results that seem unbelievebly hard.
Before i always had a reading of 80-120 mg/L which is soft ( i still get that reading with the GH test kit) the TDS meter however gives a reading of 947ppm in my comunity tank and 586ppm in my breeding tank. I have been doing loads of research on the net this morning as to what these values mean and how to convert them etc but as far as i can work out
1ppm=1mg/L, which would put my water at liquid rock!! (lake malawi)
other converisons i have found are
1 ppm = 1 mg/L CaCO3
1 ppm = 0.058 grains/US gallon
1 ppm = 0.07 Clark degrees
1 ppm = 0.10 French degrees
1 ppm = 0.056 German degrees
1 French degree = 1 hydrotimetric degree
1 Clark degree = 1 grain / Imperial gallon as calcium carbonate
1 French degree = 1 part / 100,000 calcium carbonate
1 German degree = 1 part / 100,000 calcium oxide
1 grain/US gallon = 17.1 ppm
1 grain/US gallon = 1.20 Clark degrees
1 grain/US gallon = 1.71 French degrees
1 grain/US gallon = 0.958 German degrees
But depending which calculation i do depends how hard my water gets.........im either crap at maths or am missng some information.
Can anyone provide any help regarding, how do i convert my ppm figure to a workable value, ie is 586ppm soft or hard?, how do i convert it to GH? and the meaning of life?
Thanks
Andy