AirMax PS40 Aeration System With Four Diffusers No Airline - 115V airextra you can use the 14

you can use the 14 day cycle as outlined below

3 phase circuit for low operating costs

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

however the compressor is capable of running up to two diffusers as well

AirMax PS40 Aeration System With Four Diffusers No Airline - 115V airextra you can use the 14For ponds up to 4 acres in size. The PS40 will aerate 1 acre 3 to 5 feet deep 2 acres 5 to 9 feet deep 3 acres 9 to 12 feet deep 4 acres 12 feet deep or greater Please contact us for a free aerial mapping if you aren't sure of what aeration system will fit your pond the best. Kit Includes: Silent Air Cabinet and Pump Four four membrane stick diffuser plates Fittings, clamps, and airline found below in the related products tab. *Airline and fittings