After searching the internet and some posts on this site, I still need some help.
Last year our above ground pool began getting dirty on the bottom. I vacuum the pool everyday, backwashed, and rinsed the filter then set the valve to filter. The next day the dirt was back. It seemed as i was vacuuming the pool, there was dirty water coming through jet in the pool. After I closed it, I emptied the sand from my filter and took the laterals to a pool store. They said my laterals were good and they advised me to replace the sand. So i did.
This year i opened the pool. New sand in the filter and everything was good. Now within the last month, I am vacuuming the pool everyday again. I vacuum the pool on filter setting. Backwash the filter until the eye glass is clean then I rinse for about 30 secs.
While vacuuming the pool I noticed the water is Dirty coming into the pool.
Yesterday a friend of mine told me to add algae cide. I did it last night and everything looked good this morning. This evening I looked at the pool and the pool is Dirty on the bottom again.
What is wrong or what am I doing wrong?