The bottom is painted brown so it looks like a Spring.
We were there June 5-12th and spent time at both pools.
SSR hi rock spring pool was a brown bottom pool before the refurbishment last March. Now it is a bright blue and you can see bottom at night. It is most likely a safety feature for the guards to be able to see the pool bottom at night. I noticed it when we visited SSR during our trip
Jambo may be next for a pool refurbishment, but maybe they were waiting for Kidani to open. I wouldn't be surprised if Jambo gets a rehab next January.