Not sure how much airline you may need

Meaning there's no need to remember to add bacteria every few days for it to work well

strain relief attachment ensures that the weighted tubing will not become detached during installation or maintenance

Effective aeration can be achieved in 1/4 acre ponds 5 to 8 feet deep

EarthTec® is non-toxic to humans or fish when used as directed

Airmax LR50 Diaphragm Kit For The SW40 Pond Fountains Not sure how much airlineKeep your SW40 Airmax Shallow Water Series Aeration System running at its best with LR50 Maintenance Kit. Over time, seals and moving parts wear and breakdown causing decreased system performance. Airmax Aeration Maintenance Kits contain the parts you need to restore your system to it's maximum potential. Kits should be installed every 6 12 months or if you experience a reduction or loss of bubbles at any of the diffusers to ensure optimum performance.