Gardenweb is great for most pool stuff...

troublefreepool.com is a great site for pool chemistry questions.

the two together make a mean duo!

good luck, sorry I can't answer your question.

Cyanuric acid, conditioner, stabilizer, whatever you want to call it is a holding agent for chlorine. It is mildly acidic so if you're in a 3m mode, it should not hurt. Just lay off the chlorine for a week or so. It seems like I tell this to everybody, but get those tablets out of the skimmers. You are sucking strong acidic based chlorine into your equipment and that is not a good thing. Get a floater or feeder. If you use a floater, tie it off so it does not float to a step and etch the plaster.

Thanks for the tip repair guy, what is a 3m mode? I'll buy a floater today, my SWCG won't start for a month so I'll add chlorine for a while.

The cyanuric should be added after the first backwash not because it will harm the plaster, but because when you add it you add it to a filter. The reason for adding after the first backwash is that the cyanuric get dissolved while in the filter, so befor it dissolved it will boost the filter pressure significantly. If the filter is allready dirty this can create some pressure issues not allowing enough flow to dissolve the cyanuric possibly causing some to get backwashed out.