Filter with volume

Hello

I see that all traders use volume to filter the universe of stocks they want to trade.

I have seen people that use a 300K, 500K or 1M Limit.

I am using TC2000 and there are several ways to do this filter:

The daily volume?
The 50 EMA of the volume?
THe volume yesterday, or today?


How do you use it and why?

 

bar-by-bar volume tells you where you are in trend.

Ends of trends volume tells you when to reverse.