I HAVE A SEPTIC TANK THAT IS 4 YEARS OLD.FOR THE LAST 6 MONTHS THE BATHTUB ON THE UPPER FLOOR WILL START TO DRAIN AND CAUSE BOTH TOILETS UPSTAIRS TO BUBBLE AND SPLASH WATER, THEN THE TUB STOPS DRAINING, FOR 5 MINUTES THEN TAKES OFF DRAINING WITH SUCH FORCE IT SUCKS THE WATER OUT OF THE TOILET’S, NO PROBLEMS IN LOWER BATHROOM, NOW MY WIFE IS GETTING MUD OUT OF THE DISHWASHING MACHINE DRAIN!! HELP!!