Hi, I have a pump that has started shooting water out in spurts. It is a 24 Watt, 7 foot max height submersible pump that I've been using on aquaponics systems for 6 months. I switched from one aquaponics system to another about 2 months ago. It was running fine until last night until it started spurting (in between spurts of water, it's shooting out air). If I remove the pump from the system and test it, it works fine. I hadn't changed anything in the system. I went through it now and checked and reset all the connections and lowered the height level from about 5.5 feet to 4.5 feet. It still continues spurting. When I ran the pump by itself I couldn't tell if it was performing normally or at less pressure than previously. Any thoughts?