@bob31 @Myfriendis410 @Ragnar I have a Apera ph20 meter it’s calibrated at 4.0-7.0-10.0 I keep it storage solution. I will make up a 6.5 gallon of water then before I make the next gallon I will rinse and dry for each gallon I make after that I’m I doing this right. I never make up water till it’s time to water. Thanks
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