Evan, just wanted to point out for any newcomers who stop in. . .
CYA is not needed for an indoor pool. Unstabilized chlorine is broken down by the UV radiation in sunlight; even if your pool bldg has skylights/windows, insufficient UV will pass thru to cause the rapid degradation of the chlorine which occurs in outdoor pools.
This is of course good since it means less chlorine usage and no CYA to buy. BUT the drawback is that UV radiation not only breaks down the GOOD CL (FC) but also the BAD CL (CC). CC's can be very difficult to eliminate from indoor pools! Instead one must plan ahead in order to PREVENT CC buildup. The use of an enzyme treatment (such as Pool Perfect) and/or non-chlorine shock work with the chlorine to break down and remove organic wastes, which otherwise lead to CC accumulation.
More details are in the "Indoor Pools" thread. . .