Measuring nitrogen using TDS meter ?
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  #11  
Old 12-17-2017, 07:45 AM
Evendozen Evendozen is offline
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Thanks for all the great info Ray.

And to Joe-- your way is most likely how I will use the meter.
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Old 12-17-2017, 08:09 AM
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Orchid Whisperer Orchid Whisperer is offline
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Following Ray's comment, EC will vary a lot with factors such as the water quality you start with, aand the type of fertilizer. Ray's numbers (above) for added K lite would probably be different using reverse osmosis water than for tap water from Chicago or Atlanta.

Also, it would be different if you used a non- K lite fertilizer blend. If your tap water is fairly consistent in quality, you could work out the concentrations with a calculator (see Ray's website).
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Old 12-23-2017, 12:02 PM
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estación seca estación seca is offline
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TDS of 268 is fine for a lot of orchids. Only the cloud forest ones, and a few others, would need water more pure than that.
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