I'm leaving on a vacation to Costa Rica shortly and have been pegged to assist in some pool maintenance while I'm down there. For background this is an inground pool at a private home made of concrete or gunite or plaster. (I'm only slightly familiar with the differences in these because my pool is vinyl.) I'd say the pool is about 15 000 gallons. It was a saltwater pool but I'm told it's operating on chlorine right now.
So here's my role. Apparently they periodically drain the pool, brush it because of dust, repaint it blue and refill it. I'm going to assist in this process on my visit. So the problem we're attempting to resolve here is the dust, which by the sounds of it must be bonded to the pool if we have to brush to remove it. I presume this is because the calcium level is not kept at the appropriate level and it is dissolving out of the plaster??
My questions are:
* Is it too little calcium in the water or some other problem?
* Is it necessary to drain the pool to remedy this?
* Can this be avoided in the future?
* Is whether it's gunite or plaster or concrete significant or are they all treated the same?
* Anything I have to consider in light of the fact it is in a tropical climate with lots of rain?
Any tips would be greatly appreciated.
Knows Enough to be Dangerous.