Depends on why it breaks. A photo with the rocks removed would be more helpful to see the whole system.
Just a guess without knowing the specifics, try and find a higher psi hose, maybe rubber instead of plastic. Depends how is the hose connected to the pump, which hose is breaking, the discharge hose, or the connections etc..
You may be able to google search for businesses in your area that make custom rubber hoses, or you can make one yourself depending on what fasteners you need to secure it to the pump. Hydraulic hoses for example are made of rubber and made to withstand high pressures, and most hydraulic hoses are custom made by specialty businesses. Radiator hoses are a stronger material. Any hose that can stand 50 or 65 psi is good enough, 80 psi would be even better.
If you find a custom hose business, you could ask for a quote and describe what you need, maybe its possible. Otherwise you can buy the fittings yourself and find a hose on
amazon. It depends what fittings you need, they are interchangable to the hose. Google for "2" high psi rubber hoses" maybe can get you started if you wanted to order the parts. Can't really be more specific without a photo of the connections.