Explain to me TDS, PPM, EC...

[LOC NAR on probation]

Can someone explain to me Total Disolved Solids, Parts per Million, and EC? I know readings are different for different nutrients/rez. sizes etc. but is there a general rule of thumb what should be what?

Sorry I was medicated.

Do you want to know the mixing of GH 3 part. Like the PPM mix number of ml per gallon of water ?

latewood has a very good modified Lucas formula. The lucas works good but latewoods is better for me. When we first started I think we did GH 3part like 1-2-3 then in flower turn to 3-2-1 at 5ml to 15ml per part per gallon of water. Depends on how strong you want it.

This is why the meter is sooooo important. Other wise your really flying blind.

TDS. EC. and PPM are all the same thing. Ec is electrical conductivity measured in the solution which we figure total disolved solids from which gives us a parts per million counts.

[medicatedman]

General Hydroponics Flora Nutrient PPM Calculator

Daddy
ps, all meters measure EC convert to ppm or TDS by multipling with a factor of either 0.50, 0.65, 0.68 , 0.70, depending on the manufacturer, tis why if everyone used EC for the standard we would ALL be on the same page. kapesh

daddy sorry for jumping in asking a question, in my areo system I have roots flowing into my res is that ok.:stoned: