Low Flow in Your Pond? Pump Troubleshooting Checklist (Fast Fixes)

When flow drops, ponds go downhill fast. Skimmers stop skimming, filters stop filtering, oxygen drops, and algae gets a free pass. The good news: low flow is usually something simple — a clog, an air leak, or an impeller that needs love.

Step 1: Check the obvious clogs

• Skimmer basket packed
• Pump intake blocked
• Filter pad/media clogged

Step 2: Look for air leaks

If the pump is sucking air, flow drops and you may see bubbles at the return. Check fittings, unions, and water level.

Step 3: Clean the impeller

Impellers collect string algae and grit. A dirty impeller can cut flow dramatically, and it’s one of the most common “mystery” issues.

Step 4: Make sure filtration isn’t choking the system

If filters are too dirty or undersized, they become a bottleneck. See pond filtration for sizing and maintenance guidance.

Conclusion

If low flow keeps coming back, it may be a sizing or plumbing issue. Start with pond pumps and we’ll help you get it stable.