My father's new pool (to him) has something attached to some of the pipes on the equipment pad that we can't decipher.
They are the blue plastic things that are clamped on with zip ties. For lack of a better description, they look like ice cube
trays on the inside where they touch the pipes.
These are attached only on the return line - there is a 3rd one less visible in the picture above that is attached below the pool/spa return valve that is on the pool return line.
Anyone have any idea what these are and what their purpose is?