IMHO it is underpowered.
There is a recirculating system that feeds back to the tanks. Enough that I can keep WDG products in suspension. Unless you get the electric start option the Turfco's would have no electrical connections on it. I have the electric start and I also added a foamer to mine and I wouldn't be without either of them.Is there a recirculating tube on that?
There must be or the pump would dead head.
what actuates the opening of the valve to begin spraying or stopping it?
Yes I do. Early morning or short grass it is invaluable. Stops the heavy overlapping or missing spots. I don't use it all the time but would hate to be without it. Not all lawns are square or rectangular so it really helps on those odd shaped ones.Do you think the foamer is necessary on a unit that small?
Only use them on wide boom stuff