Frequency of low-poo or co-wash is going be a very individual thing. I co-wash almost daily because I do martial arts 4-5 days/wk and it leaves my scalp horribly sweaty and dirty. Every so often I like to use a low-poo (like the SM Moisture Retention Shampoo) if my scalp and roots start to feel heavy. Some people cannot co-wash at all and use low-poo much more regularly. It will probably take some trial and error to find what works best for your hair.

Modified CG since 11/5/11
CLEANSE: CJ Daily Fix, DevaCare No-Poo, CHS Treatment Shampoo
RO: SS Caitlin's Conditioner, CJ Beauticurls Strengthening
LI: SS Repairing Protein Treatment, CHS Silk Leave-In
STYLE: Re:Coil, Curl Keeper, Deva Ultra Defining Gel, Curls Rock Amplifier,Sweet Curls Elixirs Okra Gel and Hard Hold Gel, SS Curl Enhancing Jelly and Firm Hold Gel