How do I safely drain 60 year old concrete pool?

Biggums

New member
Nov 6, 2016
2
wilmington, DE
I need to power wash and paint this 60 year old concrete pool. It has 2 manual hydrostatic valves at bottom of pool with main drain between them. I have been told by one source I need to open both of these valves before I drain the pool? Another source said I can drain the pool all the way before opening those valves. Can anyone straighten me out on this? Also, does the speed at which I drain the pool matter?
 

jblizzle

Mod Squad
TFP Expert
LifeTime Supporter
May 19, 2010
43,196
Tucson, AZ
Do you have any idea of the ground water level? I assume since you have the hydrostatic valves or just be high. I would not want to drain more than about 50% before I had the valves open to lessen the chance of the pool floating.