You need to discount the water around your skylight as having anything at all to do with the blank tank flush operation. Even if the check valve under the cabinet was faulty how on earth would the water spray out of the cabinet and then go up to spray the skylight. Your description of the problem with the black tank is a bit too fuzzy for me to understand. Sorry. Why would you back flush the tank until it is full anyway. That's not necessary. I back flush all the time and time it so I have about a half tank and then open the valve on the flush gadget. I night repeat it several times until the water comes out clear.
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Richard Charron
Zephyrhills, FL
2015 Ford F150 Eco Boost
2016 Coachmen Chaparral Lite 29MKS
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