That is actually what I am doing. My cell is installed but not yet connected. Meanwhile I am chlorinating with bleach and letting the salt dissolve in. I estimate I will need 400# so i am letting 200# settle in and I will test with my Taylor drop test until I am in the 3000-3500 range, adding one 40# bag at a time. By then I will be ready for the SWCG to take over. I will also raise my CYA level to 70-80 first as well.