Because of the sediment, the CSV1W is probably the best choice. However, you switched from a 3/4 HP to a Ĺ HP, and that CSV adds a few pounds of friction loss, so donít expect the maximum flow available to be as much as before.
One check valve on the pump is all you need.
I always recommend a shroud if it will fit. The CSV will make sure you have a minimum of 1 GPM to keep the pump/motor cool. However, this 1 GPM has to go past the motor to cool it. That is what a shroud does, makes the flow go past the motor. Without a shroud, the flow will not go past the motor unless it is a bottom feeding well.
Installing the CSV in a vertical position will help keep the sediment from settling on the bottom. Other than that the CSV is self flushing and no maintenance. The spring chamber is dry and never sees the sediment.