I am just now completing the conversion from Baquacil to chlorine (it's going quite well, too!) and I understand that I will need to change the sand in my filter (Hayward pro series, model no. S244S, 300lbs sand) when the process is complete. This is our 3rd season with the inground pool and I have yet to change the sand so I really don't know what to do other than just scoop it out. Any advice would be welcome! Thanks in advance!