Kitchen sink drain issue

[Devil]

https://www.google.com/search?client=fi ... +unblocker

[bmwx5]

Does your drain pipe go into a grey water tank then soaks away through the soil ? I have had the kitchen sink drain very slowly lately, tried the usual methods however I found the discharge pipe was under the water tank level due to all the recent rain. When the water level goes below the sink drain pipe the problems resolves itself.