J-300 Seriesnot in use. Certain jets may not draw air when jets pump 1 is running in low speed;this is considered normal.10.10 Optional Audio System (J-335 - J-375)Spas equipped with the optional Jacuzzi audio system offerenhanced enjoyment. These models include an integratedAM/FM/CD receiver with four high-quality marine speakers forunsurpassed sound quality and long-life. Refer to section 17.0,(page 41)11.0 Automatic Filtration CyclesYour new spa includes a 24-hour circulation pump which filters the watercontinuously. The circulation pump draws water through the skimmer bag andone of two filter cartridges to effectively remove small debris in your spa. Note:the 24-hour circulation pump system also supplies heated water to the spa whenthe heater turns on.The control system activates a programmable “standard” or “economy” filtra-tion/heating cycle to remove larger debris missed by the 24-hour circulationpump filtration system. These cycles utilize pump #1 low speed and the secondfilter cartridge to quickly “skim” the water of large debris and minimize their“bath-tub ring” effect. Apart from their skimming benefit, each mode also effectsthe operation of your spa’s heater. Refer to sections 11.1 and 11.2 below foradditional information.11.1 Standard Filtration/Heating Modes (F0-F3)Standard filtration/heating modes are typically selected by customers in coldclimates where heat up times are extended due to lower ambient temperatures.In these modes, the water temperature is regulated by the set temperature,24-hour circulation pump, and heater which turns on as needed. After theprogrammed set temperature is reached, the heater turns off and the circula-tion pump continues to operate 24-hours to filter and clean your spa unless insummer logic; see section 14.1, page 33.11.2 Economy Filtration/Heating Modes (F4-F6)Economy filtration/heating modes are typically selected by customers in warmclimates where heat up times are minimized due to higher ambient tempera-tures. In these modes, the water temperature is regulated by the set temperature,24-hour circulation pump, and heater only while a programmed filter cycle isrunning (unless in summer logic; see section 14.1, page 33).24