I am by no means a plumber. forgive my ignorance. I want to move my washing machine and sink . I went to look at the floor drain where I would like to tie into. I noticed two black tubes entering the floor drain from either side. the drain has water sitting about 4 in. from the top of the slab floor. the only use that I know of is another tube from the furnace which periodically drains into the drain at ground level. The water sitting in the drain has a lot of sediment. Am i still able to tie into this drain.