I just installed my Stenner pump and tank and still tuning the dosage. I however have a question. The Stenner tank has a small reservoir area below the pump (there is a lip that goes around the flat top of the container). When it rains, this area fills with rain water. Do others face the same problem? How did you address it? I was thinking of just tilting the tank so that water would just accumulate in a smaller part of the reservoir but it does not resolve the issue. I don't like the idea of putting a plastic cover over the pump.