With the current heat, the plants are drinking a lot more than they are eating, so the ppm is increasing.
I will be keeping an eye on this to see if it is going to be an issue
@Boradan,
What a great grow, she's a mini tree! You should enter her in the grow contest. Nothing slowed her down, not even topping her, and she's an auto! Looks fantastic. Hope she gives you several ounces!