To maximize the lifespan of your domestic RO membrane, start with regular maintenance and timely replacements of pre-filters and post-filters, which help remove larger particles and chlorine that can damage the membrane. Ensure proper water pressure and avoid exceeding recommended limits, as high pressure can lead to premature wear. Regularly check for leaks and monitor the system for any performance issues. Maintain optimal pH levels in your water supply, as extreme acidity or alkalinity can harm the membrane. Lastly, consider periodic sanitization of your RO system to eliminate bacteria and biofilm, ensuring efficient operation and longevity of the membrane.