Softener mineral tank makes a roaring or churning noise during backwash

Safety first: Noise alone is not dangerous, but ensure drain lines are secure to prevent movement.

Step-by-step checks:

• 1. Confirm drain flow control size: Verify that the installed Marlo drain flow control button matches the resin tank size and model specifications.
• 2. Measure backwash flow: During backwash, capture drain water in a bucket for a timed interval to estimate gpm. Compare to Marlo's recommended rate.
• 3. Check pressure: High inlet pressure can increase backwash intensity. Install or adjust a pressure reducing valve if needed.

When to replace parts: If backwash flow is excessive, replace the Marlo drain flow control with the correct size for your tank.