The Optimax is the most popular filter in the Graf filter lineup.
An excellent filter for both residential and small to medium sized commercial rainwater harvesting installations. The Optimax® filter provides a highly efficient, low maintenance, self-cleaning solution.
Float Switches, Versatile Control and Pump Duty Heavy-duty float switches designed for accurate liquid level control in many applications including rainwater cisterns and wastewater environments. Designed for 115-230V direct pump control and 24V valve control signals.
Water from the filter is fed into the tank via the Calming Inlet to prevent swirling of the water, disturbance of fine sediments and to introduce oxygen at the bottom of the tank. This device also helps prevent mosquitoes.
Differs from the standard overflow siphon with the inclusion of a slotted steel rodent guard. Dirt particles that are lighter than water (e.g. pollen & dust) settle on the water surface as a floating layer. This floating layer is removed when the tank overflows by means of the overflow siphon in the tank. Also aids in mosquito prevention.