New Gunite Pool startup questions

[waterbear]

I
The finsh installer (plasterer) told me to run the pump 24 hour a day, brush twice a day, and not to add any DE poweder (My filter instructions say to never run filter without DE powder but I didn't read this untill Wednesday night - I have now added the DE).
mike

You might want to check your DE grids to make sure they didn't clog with plaster dust before you added the DE!

[mshumack]

My pool pressure was 20psi when I started the pump for the first time. It went up to 30 psi after a day or two of brushing. I backflushed then and the pressure dropped back to 19 - 20 psi. After another full day of running and brushing, the pressure went back up to 30. I repeated the backwashing and again the pressure returned to 20.

After I get the plaster dust somewhat removed (hopefully in a day or so) and I don't see a cloud of dust with each brush pass - I will shut down everything and dissassemble the filter. I expect I will need to clean the grids in a mild muratic acid solution at that time.

How long does it usually take before the plaster dust is gone?