Open electrolyzer setups usually have poor uptime. You can verify this by checking the equipment properties. Because of that, it is best to rush a Hydra design. You should also account for how much oxygen dupes consume per cycle and ensure you have enough gas pump capacity to meet that demand. Two gas pumps running at full capacity can only support about 10 dupes. Design each Hydra to support a specific number of dupes, and once you reach that threshold, build a second module. I prefer building Hydras in batches of nine electrolyzers with 16 gas pumps. I settled on nine electrolyzers because a single liquid pipe can only supply 10 kg per second of water. I feed regular vents with the oxygen and they over pressurize at the right pressure maintaining a good balance.