Our pool was not covered during the winter. It was green and we added yellow out, then 2 pounds of pool life turboshock. The next day, at the advice of the local pool store, we added pool Life back to blue, following the instructions on the box. Almost immediately, the clumps were forming, but they did not sink to the bottom, they are floating on top, which means I cannot vacuum to waste. What should I do now to get this to sink to the bottom? Thank you!