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Heating pad water temperature in the pool (3-5 degrees), the speed of the heating water depends on the temperature of the heated water and the ambient temperature. Easy connection to a filter pump, set of 3.2 cm and 3.8 cm adapters included. Suitable for a filter pump with a flow rate of 9,462 l / ha or less in a preheater or a sand pump with a flow rate of 7570 l / ha or less. Hole diameter 32 mm, mats can work multiplexed, they can be combined with each other to increase their efficiency.