As long as the sun is up.
10 - 15 minutes
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.
You should run the filter on your 18 x 4 pool for at least 6 hours per day or for as long as direct sunlight shines on the pool. In very warm climates, you will need to run the pump for at least 8 hours.
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
if u have a filter
if u have a filter
Add the aluminum sulphate to the pool. Run the filter for two hours. Wait overnight to vacuum the bottom of the pool.
Yes. Running the pool filter pump while swimming has no adverse effects to the swimmers.
3 hrs
If you're talking about your pool filter, it should be set to filter or run. Use the bypass or recirculate setting if you wish to circulate the water without having the water pass through the filter. Use the backwash setting to clean the filter.