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the question comes---can you damage seals or blow the tank open if you fill the black tank with the FLUSHER while the drain valve is closed
Well if the hose can fill at about 5 gallons a minute and you keep the flusher on for 1 1/2 minutes you should have about 7 1/2 gallons of water in the black tank which normally can hold about 40 gallons...
You now have an AIR SPACE that the remaining 32 gallons of water would have take up. ( you have filled only 19% of capacity)
since air is easy to compress as compared to water ..in my humble opinion i don't think you come anywhere near causing damage
PER THE POST JUST ABOVE.....the only chemical i add extra is Laundry detergent ( no bleach) which will not damage a septic system
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