If your CYA is in the 50-80ppm range recommended by Pentair, and you dose according to the Best Guess Chart, you should be able to go every other day. If it's below that, you might want to buy some dichlor. On your pool (13K gallons), each pound of dichlor will add about 5 ppm of chlorine, and about 4.5 ppm of CYA. So, if your CYA is 40 ppm, and you need to get it up to 80, since it will drop slowly once the SWCG is back on, you can use about 30# of dichlor.

If you have a Sams Club nearby, they sell PoolBrand dichlor for ~2.20/lb for 50#, and ~3.00 for 12# bagged shock. Otherwise, you can get Kem-Tek dichlor for ~4.00/lb from Amazon, shipped free, in whatever size works.