The float setting may not be a major consideration...if you have lots of ground water, you have lots of water to pump. But, not having a check valve in the line may mean that much of the water you pump out falls back into the sump after the pump stops. you get to keep pumping the same stuff over and over again. You might have a check valve, but it is no longer working properly, too. Also for consideration, where are you discharging the water you pump...if it is close to the house, you are not helping matters, either; get is as far away (preferably downhill) from the house as you can. Last, the ground around the house should be sloped away for at least 6', and the gutter downspouts run away from the foundation. This will help keep excess water from the foundation and it finding its way into the sump to be pumped away. My unprofessional opinion.