Kids should play in sand, not breathe it in. Wisconsin’s New Auburn school district is upgrading air filters to prevent sand fragments from floating in from nearby frac-sand mines and getting into ...

A sand pool filter is usually cheaper to buy and run than cartridge models, so it’s no surprise they’re popular. However, it’s not all about the money, so we’ve been looking at whether this is truly ...

This is a preview. Log in through your library . Abstract A full-scale study of the conversion of rapid sand filters to granular activated carbon (GAC) filter-adsorbers was conducted by the Water ...