hello I am on a gravity-fed tank water and want to purchase a filter system to reduce/eliminate Pb from drinking water. Not mains pressure. Can you advise please on what is the best filter system and if not practical should I convert to a pressure pump?t

Hello,

Cartridges to remove lead from water are generally 1 micron or less or reverse osmosis systems are used, either way water pressure is required for these systems to operate correctly. Gravity fed tank water systems will operate in some circumstances provided the tank is located at a high point and can provide around 100 kPa pressure at the required flow rate.