That's a good idea about a hollow pen thanks. I've got two gallonsof water that have been out for a few days I'll flush it. Thanks. Ima gonna have to wait a few days tho cuz I just watered a few hours ago. Shud I take readings from a few spots cuz my damn electric one says 6.4 or so on one side and as low as 4.9 in another. Thanks man this is my first grow ever and I don't want to have to see a dealer again in my life after this if possible. You've been a big help if ur curious I can let u know how its going in a few days.