Which brand of floor heating water separator is good? What are the imported water separators?

There are many brands in the market of floor heating distribution main pipe: Germany Manruide (common in the market), Germany Green Brand, Germany Irvine Top (common in the market), Italy Eminico (common in the market), Italy Pitnori, Italy Giacomini (common in the market), Italy Jacques Fei (common in the market), Italy Jetfly (common in the market), Germany barrick, Germany Aubeneau and so on.