Hayward GL-235 AquaSolar Control
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Hayward's AquaSolar Dual Differential Control.. The GL-235 is a differential temperature control for solar heating of pools, spas, and hot tubs ..America's best-selling solar control is easy to operate, and provides reliable and accurate performance. AquaSolar control functions include differential temperature control, selectable high limit, programmable freeze protection, and automatic nocturnal cooling (for pools that overheat in hot climates).