Backwash first then shock. If you shock and then backwash you will be throwing away the shock you just put.
how do i calculate the volumn of backwash in a pool
no... you should call a professional to come inspect your pool
Average pool filter: Backwash 5 minutes and rinse for 1 minute.
Setting the filter to backwash cleans the filter, running your pump to filter cleans the water in the pool. Brushing the walls of your pool cleans the walls of your pool... and so on.
Vacuum the pool slowly on backwash.
No you only backwash your pool when your filter pressure on your filter is high 30psi and above on most pools. If you backwash your pool be sure to add two scoops of de to your skimmer. If the presure is still high the u need to clean the filter
OF COURSES YOU CAN'T
That can change from pool to pool, In most cases if the pressure indicator is up to about 3./4 of the way it is time to backwash. this coincides with weak suction.
If the pool is really dirty then it is best to set the filter to waste.
You add D.E. to a pool when you do a fresh filter clean. You also add D.E. if you have to backwash your pool more than normal. When you backwash the pool it is also dumping the D.E. out so it needs to be replaced to keep the grids covered so the pool can filter properly. Hope it helped
Drain/Backwash the pool, clean the inside, and add fresh water.