Fluctuations in the acid flow rate in the first and second absorption towers

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I would like to ask fellow sea professionals: When the new unit is brought online, there are fluctuations in the acid flow rate to the first and second absorption towers. The initial assumption was that the blockage was caused by the filter at the inlet of the submersible pump; however, cleaning the pump chamber manually and removing the inlet filter did not resolve the issue, so an inlet blockage was ruled out. At the same time, the reasons for low pump tank level and reverse rotation were also ruled out. Secondly, it is necessary to detect cavitation at the pump inlet; when acid is returned to the system, a vacuum can form in the high-point anti-siphon line of the acid return pipeline, allowing air to enter. To address this, a blind flange should be installed at the anti-siphon pipe. The issue of fluctuating acid flow rate during the commissioning phase has been resolved. However, after starting the sulfur dioxide blower, the pump chamber operates under negative pressure at -5 KPa, and fluctuations in flow rate occur again. I would appreciate it if experienced users could help determine the cause and suggest ways to address this problem Thank you so much!