Water leaking from the union connections on the suction or discharge side of the pump.

Safety first: Turn off the pump and relieve pressure before loosening unions.

• Tighten unions: Hand-tighten the AstralPool pump unions; use a strap wrench if needed but avoid over-tightening.
• Inspect O-rings: Open the union, inspect the O-ring for nicks or flattening, and clean the sealing surfaces.
• Lubricate and replace: Apply silicone lubricant to the O-ring and reinstall. Replace with genuine AstralPool union O-rings if damaged.
• Check alignment: Ensure the connected pipework is not putting sideways stress on the union; adjust supports if necessary.