I have a Grundfos pump about 35 feet down my well. It delivers just under 11 GPM (measured) at the shut off pressure of 70PSI. The 1" poly line runs about 50 feet outside the house and about 70 feet inside. I'm doing some re-plumbing and it would not be too difficult to add a water hammer arrestor just inside the house on that 1" line. The only check valve is in the pump. Think it would be worthwhile?