You'll have better control of the dog on a table and it'll save your back. You can also build a table using inexpensive materials found at the hardware store. Take good care of it to maintain its edge and balance. Brands like Ring 5, Bio-Groom, Tomlyn, St. Aubrey, etc. are excellent products. Don't use shampoo meant for humans.
Dogs require a different pH balance. a blowdryer.
Bathing should be done monthly and can be done oftener if you prefer. Bathing as often as once a week will not dry out the coat if you're using good products and doing the job properly. Most show Chows are bathed weekly. Before the bath, remove any large mats or dead hair that might be shedding out. Wet the coat thoroughly and apply shampoo being careful to keep soap out of his eyes.