if he got a basket from Loews or home-depot they are improperly made and the gasket and tail piece blocks off half of the flow.
look down the basket drain with a flash light take a pic and post it and i will tell you if its one of the bad baskets or pm me.
Brought it up to the store manager and corporate won't recall 10,000 piece across Loews.
Welcome getting scr*wed by the big box stores.
3 years and 5 hours later i caught the manufacture error the manager was a good guy and said even after 3 year he would refund my money.
P.S. if it is a wet vent or airlock problem you can use a mechanical vent under the sink.
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