Our single day courses are packed with useful insights and hands-on experience. Southampton’s favourite emergency plumbing and drainage service, with no call out charge. First call heating & cooling is licensed, bonded, and insured we’re bbb accredited with an a+ rating and have won the angie’s. We clean your pipes, not your pocket! Enter your postcode to see if you qualify. Most drain cleaners advise waiting 15 minutes or more after pouring.