Intelligent question ...

Sparingly-soluble alkaline ash may act as a dispersing agent by raising the pH and exchangeable Na, while failing to release sufficient salts to encourage flocculation. The addition of FGDG to the fly ash decreased effluent turbidity and increased the leaching

of B from the column. The presence of a Bt layer was effective at decreasing effluent turbidity, but failed to retard the movement of B from the Ap horizon...