My first post! Hoping to get some advice. I've had my above ground pool for 7 years. I have the Pool Frog system. Lately I am having a problem with the replaceable bac pacs. I check the bac pac weekly and it is dry, like it's not getting any water circulating into it. Thus, the chemicals are not being distributed which cause problems. There does not seem to be any problems with leakage or pressure. Any help would be appreciated. Thanks!