Flo Thru™ A-Plus Provides uniform water movement and dissolves bicarbonates that release calcium to displace sodium. FloThru™ A-Plus is an acid-based penetrant that dissolves bicarbonates and frees calcium. Available soil calcium will then displace soil sodium. The penetrant “flattens” droplet beading by reducing water tension. This results in even coverage of sprays on leaf blade. The penetrant also provides even water penetration into the soil which reduces localized dry spots.