Looking for suggestions on best pumps to use for watering and if any issues with 'dead heading' the pump. I have a medical grow with 72 plants, so I have 1/2 hp utility pump with a 50-foot hose. It pumps well when new, but over time it seems to burnout. If I am watering and pump is running it works great, but between plants the pump is running but I am not watering as I switch to another pod or plant. So it appears this puts a strain on the pump. Would watering by hand just using gallon bucket be better or easier? Any help would be greatly appreciated. thanks