Customer called for a slow/non draining tub. Dispatched to address and tested tub by running water, and water drained very slow. Removed tub drain plug and saw a large amount of hair in the drain assembly. Ran drain cleaning equipment in tub drain and cleared blockage. Threaded tub drain plug back in place, and ran large amount of water to confirm blockage was cleared before cleaning up a the area. Note: cpi plumbing and heating does not warranty or guarantee any drain cleaning.