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I have a durso system and this happened to me when my return pump was too slow. If the water sounds like surges then that comes from too low flow, where the siphon breaks, then returns once the water reaches the rated height again. How many gallons is your return pump rated for?
Thank you both for the information that is the conclusion I came to because the water is going up and down that the pump is not putting out enough flow. Thank y’all for helping me I really appreciate it!