Hope your all keeping nice and warm. Just a little query I have been giving liquid oxygen a try the last two weeks and finding it ok good to have an endless supply at the ready which is wonderful as some may remember I am at present being screened for lung valve so lots of hospital visits and quite a few hours out of the house so thought the liquid oxygen would give me better back up. Can someone explain to me why we have pulse and continuous flow offered I understand that the oxygen supply in the canister will last twice as long when on pulse but is there a reason why one is better than the other for any other reasons . I have also been looking at portable concentrators which of course are battery operated but most seem to be on pulse rather than on continuous flow which is what I use as a rule and as I use it on Number 4 it chows oxygen pretty fast. Just looking for others views tips and hints learning as I go.