The pressure in my sand filter has gone up, partly because I've SLAM-ed my pool and added too much DE over the weekend. I'm curious to try to deep clean the sand filter, cos now with the low pressure, the spa (attached to the main pool and overflows into it) doesn't fill up as return pressure is too low, and rate of filtration for the pool is much slower. Before I embark on this project, I have a few questions:
1) I have an Aster 99 sand filter (with side mounted flow pipes). Does anyone have experience deep cleaning this model? I've mainly seen Hayward top mounted sand filters used in deep cleaning demos. Not sure if the side mounted pipes play a part.
2) I've misplaced the users manual, so I'm not sure if opening the filter simply mean just unscrewing the top after turning it off, or do I need to release the pressure or do something else before opening it. Likewise, I also won't know if the amount of sand I have in the filter is adequate. I'm guessing I'll need to get the user's manual from the pool shop or find it online somewhere.
3) Do I need to drain the water from the filter via the port at the bottom for the deep clean, or is that just for when I change the sand?
Appreciate any advice and thanks heaps in advance!