Unfortunately, it looks like they substituted the K-2005 for the K-2006 that you ordered...I would call them and raise some cain--maybe you'll get lucky and they'll offer to swap you for the right one, or at least send you a DPD-FAS that you can use for high chlorine levels. I would point out that the reason you ordered the K-2006 is for the high chlorine measurement, and they've subbed a kit that won't do the same thing. Never hurts to try!!

The foaming is probably the clarifier breaking down. Clarifiers work by making smaller particles stick together so they can either be filtered out through the filter media or drop to the bottom of the pool so they can be vacuumed--they do not kill algae. It takes chlorine to kill algae. The 10% liquid chlorine bottles from HD are fine--but we really need an estimated volume to be able to tell you how much to use. Hopefully one of the construction (or at least geometry) gurus will be by shortly and can give us an estimate.

Your CYA will only come down over time due to splashout or frequent backwashing, but it will be very slow. There really is no disadvantage to running higher chlorine levels, with the exception of the limitations of your kit. I run my CYA at 80-90 on purpose and maintain a high-chlorine pool, since my pool is in full Louisiana sun all day--and I have much less chlorine loss and have to add it less frequently.

Janet