ok so i just got my new ro/di and i was just going to hook it up to the skin faucet when i need to use it which will a 4 gallong supply tank it has with will probably be only once a week i will need to run it. so can i just unhook it from the faucet while i am not using it or will this screw up the membrane, do i need to have constant pressure hooked up or can i unhook when not in use ???