We installed a new double sink in the kitchen, replacing the old double sink, now the water will not drain away and takes all night to drain.
I bought the ABS pipework from Home Depot and connected the sinks as advised, one sink has a lateral pipe going to the second which then drains into to the P-trap, via two 90 degrees bends. (see attached photo). The 90 degree bends are because we moved the new sink a few inches to the right so needed to divert the downpipe back to the P-trap. The man at Home Depot said I have an airlock so the water won't drain. I tried snaking the pipe after the P-trap and I've tried Drano but still the water will not drain. Any ideas what I can do?