I know that we aren't supposed to use our robotic vacuum or any vacuum with wheels for the first 4 weeks our pool is open. However, even after brushing twice a day for a week, there's still a decent amount of sediment at the bottom. Is it possible to use one of those cheaper style vacuum heads with just brushes instead of the normal wheeled nozzle you have on an in-ground pool vac head? To me, the brushes seem no different than those on our pool brush. I don't want to ruin our plaster but I'm also pretty picky about dirt in the pool. Thanks in advance pool pros!