I was researching shock methods (since I usually just pour liquid or powder at the returns and add the step of brushing when I use the powder), and happened upon mention of the "recirculation" method.
I was instructed to never add shock directly to the skimmer as the heater core and other components can be damaged, so i never thought about it, but it seems sound. Basically, you turn your multiport valve (necessary for this method) to recirculate, and then slowly add the powdered shock to the skimmer closest to the pump (i.e. with the most suction pressure). Wait until the "white cloud" stops coming from the returns, and then turn the valve back to filter (not forgetting to brush the walls and bottom of the pool).
I did some searching and haven't found much mention of this method, but another site recommended leaving the valve on recirculate for 24 hours to allow the shock to really circulate and do it's thing before filtering the water again.
I am surprised by the lack of mention around the web on this, because it seems like the quickest and most effective way to distribute shock, especially if you have a lot to add. Not even my pool professional or my local pool store mentioned this. It would certainly be easier since they sell 5 lb tubs at a cheaper rate than buying five one-pound bags. I happen to need to add 5 pounds at a time.
So my question is, if you have an in-ground pool, what method do you use? Have you tried the recirculate method? Doesn't the recirculate still push water through the heater?