A little info for those people too scared by doitall to let children swim in indoor pools with no de humidifiers. The disease he mentions only develops in almost still untreated waters. Swimming pools correctly maintained, as ours is, are treated with either salt or chlorine which stops the disease in its track. Doitall seems to think the condensation will harbour the disease. The condensation is pure water which is absorbed bact into the pool well before and disease can start. The disease only develops in almost still water unlike that of a swimmimg pool which circulate all the time or frequently depending on the pump settings. So send the kids back in the water.