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Add the aluminum sulphate to the pool. Run the filter for two hours. Wait overnight to vacuum the bottom of the pool.
There is no filter at the bottom of a pool. Perhaps you are looking at the hydrostatic valve which is there in case your pool is emptied and Will make sure that the pool wont float in ground water.
There should be a drain plug near the bottom of the filter. Open it and let drain. The sand will stay in.
It lets the water BACK into the pool after it's been "filtered" through the filter.
It should be on "FILTER"
The cleaning schedules varies from filter to filter, but a general guideline on any swimming pool filter is to take a reading when the filter is clean, then clean the pool filter when the pressure rises about 10 psi.
Your D. E. filter grids are damaged. How old is the filter?
Run the filter when adding any chemical to the pool. It needs to circulate to do its job.
Adding algaecide to the pool when the filter is on should not do any harm in fact it should mix it into the water more quickly
On my filter, there are two connections arranged vertically. The top connection is the intake, the bottom the return.
pool whips are flexible hoses that move around the bottom of the pool to move dirt and alea towards the filter. They move from the force of the water spraying out of them.
If you are getting sand coming into the pool and have a sand filter you may have to replace worn laterals in the sand filter.