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
Add the aluminum sulphate to the pool. Run the filter for two hours. Wait overnight to vacuum the bottom of the pool.
Add potash. See your pool shop with a sample of your water and the size of your pool and he will give you what your pool requires.
It lowers PH
It will mix very quickly so you can swim immediately. However what are you putting sulphuric acid in your pool for you should be using hydrochloric or mercuric acid
In order to not cause irritation of the eyes and skin, the pH of the pool water should be between 7.2 - 7.6. Muriatic acid is added to the pool to lower the pH if it is too high.
not much.
Are these loose flakes? Could be calcium deposits if attached to pool walls etc. Are you adding proper amounts of muriatic acid? Are you testing your pH? Alkalinity?
Adding algae control to the pool skimmer helps to disperse the chemical and coats the filter media.
Acid reduces Ph So by adding potash you will neutralise the acid and regain the correct Ph
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.