I have cut a V shape into the seal, and hold my tiered shot glass over my hydroponic tub, so if it does dribble, it's no big deal. The real test is more about how the product works and it's fantastic! I put in one TSP per gal with a TBLSP of the Pure Pro Grow and have had great results. I also mix this in a 1 gallon jug to use on my indoor plants and they are thriving. I test my hydroponic garden every other day and the PH levels are right where I want them to be. I want my plants and veggies to be healthy & productive and that's what this product is about. I'm very pleased with Botanicare products!