Try a larger diameter hose.
I nolonger tow our unit and had the same problem at the campground. I built my own hose
If your using a 1/2" hose it will restrict the water flow.
You can buy water hose in bulk. Build your own making sure that the ends you install are not smaller than the hose.
If...
I had the same issue with my black tank.
I built a back flush device and after 6 tp eight times out came a large piece of clear plastic. What a mess!
At least your not dealing with the black tank.
Kurt999
I would recommend emptying at 3/4 full. Use the flush connection if you have one.
I had the same problem. I built a reverse flush out and low and behold a large cut out piece of plastic washed out. Very messy but work good since.None
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