The reason I haven't gone to the pool stores by me (there are only 2) is because everyone that works there is totally incompetent, there are no mom and pop pool shops near me so I have to rely on the franchises. If I went in there and said I need something that will be strong enough to clear my green water. They would try selling me an algecide.

Also, I couldn't go in there and ask questions on a hypothetical because they all know I have a pool already. Also I am most likely going to buy a used filter and pump because new they are very expensive and my current pool, filter and pump only cost me a total of $500. So basically I am left with what I can find in my budget and hope that it helps my current situation.