In one of your recent videos, you've added a tankless water heater for co2. Yours have a min psi? I bought one, requireso 3.6psi min. I want to use a small pond pump, but they don't put out that great of pressure. Just curious how you worked around this? Going to use a sprinkler valve, and control if from my arduino, use the house water, drain to sump. It only runs for a few seconds, not much water waste.