Try holding firming to the handles or the plastic parts of the lid, and give the lid a good twist clockwise. If that doesn’t work, try holding on the handle that is on the left with your left hand and with the palm of your right hand, try tapping or thumping the other side of the lid to crack the seal (no break it).
Also to know is, how do I open my Hayward pump?
Simply so, how do you open a cross threaded plastic lid? Run hot water over the lid. The water may loosen the lid to some degree. Combine this tip with a gripping device if the lid will still not open. Use latex dish-washing gloves if no other item is available.