We have a house that was built in 1963 that has a floor drain in the basement. The washing machine drains into a laundry tub with then hooks into the same drain line as the floor drain. About two months ago, we noticed the floor drain filling up whenever the washer would drain. This has slowly progressed past the drain filling and is now overflowing the drain if you happen to miss the drain cycle. If you turn the washer on and off a couple of times during the drain cycle you can eliminate the problem. Any ideas as to what the cause would be ( clogged drain line??) and why it would steadily get worse. The laundry tub that the water is draining into has two seperate tubs and the water also backs up into the one not used as the washer drains. It has been suggested that we could just fill in the floor drain, but I am hesitant to do so unless I know that it is the problem.
Thanks for any insight you can provide.