how to use TDS meter

i assume that you need to test the plain tap water then test again after adding your nutrients.. When someone ssys 800 ppm they are referring to the increase from the regular tap water after adding nutes?

kmclean562 said:

i assume that you need to test the plain tap water then test again after adding your nutrients.. When someone ssys 800 ppm they are referring to the increase from the regular tap water after adding nutes?

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You measure your water. You know what EC/PPM range you want to feed. You add your nutrients in the proper ratio to reach your target PPM. When someone says their feeding was 800 ppm they mean total. Water + nutrients.

Thanks for the info.. So if your water naturally has 500 ppm you would be adding 300 ppm of nutrients to get a total of 800 ppm... for me the total ppm seems irrelevant because everyone will have different ppm reading on their natural water supply. I suppose I still don't understand something. Is there a way to know the types of dissolved solids that are naturally in a water supply?

Wow that waters hard! Ever contemplated a ro system and cut 50/50 with tap water? Whats the ph on that tap?

tap water ph is 6.8 sometimes higher ppm 1800+.. my ro drinking water is 59 ppm and distilled read 0 ppm