I have a basement floor drain that backs up only when I do laundry. There is a bathroom downstairs also and the toilet gurgles when this happens. It does not back-up when I use the bathroom in the basement only when I use the washing machine. Also, it has not backed up during the torrential rains we've had in the past few days. Any suggestions?
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Do you have it vented from anywhere? There could be a clog on down the vent line past the toilet and when it's trying to suck air, it gurgles the water a little bit in the toilet. You may wanna send a snake down your vent if you have one.
with the volume of water draining from a washing machine, it could be you have a partial clog in the pipe and it can't take the full force of the washer when its draining. You might want to send a snake down the drain pipe to clean it out, or use the liquid drain cleaner option.