Pinellas County Sheriff Bob Gualtieri told a news conference Monday that someone remotely accessed a computer for the City of Oldsmar water treatment system on Friday and briefly increased the amount of sodium hydroxide, also known as lye, by a factor of more than 100. The Tampa Bay Times said the chemical is used in small amounts to control the acidity of water, but it’s also a corrosive compound commonly found in household cleaning supplies such as liquid drain cleaners.