Most of the time, you can depend on your automatic pool cleaner to keep the pool fairly clean, but sometimes you need to pull out a vacuum head and hose to get every last bit of dirt out of the pool.
Every pool is different and these articles are designed as a general guide. As always, if you are not sure of what you are doing, get a pool professional involved who can answer any questions you have and give you professional onsite advice.
We offer on-site pool school for a very reasonable price.
When you want to vacuum your swimming pool, start with the valves in the normal pool position. You can see that diagram here.