ok thanks mate will try that.think ive had that hot tub itch, had a few friends round sat night with kids aswell was too many in tub lost a bit of water , got up next morn n it had turned off due to lack of water and no chlorine levels , so i shocked it with dichlor, only had water in a week so i dont want to dump it but it seems to smell even after a good shock n 2 days later. any ideas?