I agree with the above. Trying to "mix" the gray and black tank wouldn't be advised and is probably dangerous. If you're gray tanks fill too quickly, although obvious, I would suggest using less water. For us, a couple, our gray and black tanks fill almost equally - but we have worked to determine that formula.
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Danny and Susan, wife of 56 years
2019 Ram 3500 Laramie CC SWB SB 6.4 4x4 4.10
2020 Montana High Country 331RL
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