Well i recently bought and intex krystal clear pump to replace my summer escapes pool pump that failed on me just 1 month after i bought. Anywho, today i have set up all i need connected hoses, tightened clamps, set cartridge in place. Now when i plug in the the pump it just makes a rattling sound and doesnt seem to be "sucking" or moving water anywhere. I never used this type of pump and not sure what to expect. Please help me