It's most likely a piece of debris in your flapper of your
automatic pool cleaner. Debris may prevent flapper movement or restrict flow. You might also want to check for proper hose balance. The hose should stay at a 45 degree angle to the pool floor. If it is greater than a fourty five degree angle, the hose is too light. Move the weights closer to cleaner, or move the first two weights closer to each other. If it is less than a 45 degree angle, move the weights away from cleaner, or separate the first
two weights away from each other.
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