Grey water tank won't drain

[Catchlight]

After five great nights camped a few feet from the beach on northern Vancouver Island we went to the sanidump and achieved mixed results. The black tank emptied normally, but the grey tank would not drain at all, despite the monitor registering 3/4 full.

I posted here about this problem last year and got the suggestion of adding a box of baking soda to the tank which seemed to work. I'll try that again, but am wondering if anyone else has encountered and solved this problem in another way.

I'm guessing the "nuclear option" is to replace the whole tank valve assembly, or is there a way to take apart the grey tank valve and either clear or repair it?

Thanks for any suggestions.

[gocamp]

Mine drained way better with the shower valve un screwed all the way , taken out. Rolled the opposite side tire up on a 2x4 . Have you confirmed that your valve is not opening all the way with a wire or some other method?

[Brian B-P]

Originally Posted by Catchlight

I'm guessing the "nuclear option" is to replace the whole tank valve assembly, or is there a way to take apart the grey tank valve and either clear or repair it?

Yes, dump valves are individually removable by removing four bolts... and potentially dealing with some mess. The are an industry-standard design, and so if there is anything broken within the valve they can be readily replaced, even with another brand.

[escape artist]

Originally Posted by gocamp

Mine drained way better with the shower valve un screwed all the way , taken out. Rolled the opposite side tire up on a 2x4 . Have you confirmed that your valve is not opening all the way with a wire or some other method?

Hi: gocamp... Thanks for the suggestion. Our grey drains as slow as moles asses in January. I'll try taking out the shower floor plug and see if that speeds them up!!! Alf
escape artist N.S. of Lake Erie

[steve dunham]

I remove , clean and lubricate my gray and black tank valves every Spring . It's takes maybe 45 minutes for the whole project.
Fixing or replacing the valve is the easy part , finding a way to drain your gray tank maybe the more difficult and messier part.