One word..... Vertex. Research them, do some product quality comparisons and I think you will see why they are the best there is. A shallow water A-Max system is a gimmick and will not net you the increases in water quality that you are looking for. Very low pumping/lifting rates and not worth the investment.
As for wanting to use them as a weed and algae control devise... anyone who tells you they will cure those issues is just looking to make a sale. Although some reduction can be noticeable, it is not the case all the time. Look at it as a tool to increase the water quality, help your fish population and reduce organic buildup.
