not enough air
i suspect you may not have enough air getting into the drain to allow the water to exit smoothly therefore causing a siphon at a certain level when filling up. Also check the air hole for salt creep which in turn decreases the air into the durso. If the hole is unobstructed, drill a hole the next size up on your drill bit set and test it out.
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If people don't die, it wouldn't make living important.
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