Brisbane floods have subsided, and cyclone Yasi has passed (though many in Queensland have lost everything, and Victoria is still copping damage). Yasi was similar in size and intensity to Katrina, but fortunately the areas it crossed were less populated and less vulnerable than with Katrina. One person died because he took shelter in a small room with a generator running to provide power and was asphyxiated. Two are missing after their boat capsized. Remarkably little loss of life.
On to pool stuff...
When I tested the pool yesterday, the chlorine had dropped to 0.5ppm.
Grandchildren were expected for a swim so I wanted a quick fix. Pool shop recommended one of their products BioGuard Lite Pool Oxidiser - (Active constituents: sodium dichloroisocyanurate (37.2%) and Sodium Tetraborate Pentahydrate (10%)).
I tested again this morning with the following results:
Temp = 30C
FC = 5
pH = 7.6
TA = 50
CH = 100
CYA = 40
To increase the TA I added 2kg of BioGuard Alkalinity Increaser (100% Sodium Hydrogen Carbonate)
I'll check again tomorrow to see how it responds.
Unfortunately it is difficult to buy simple chlorine bleach and the pool shop didn't want to provide liquid chlorine (probably because they were too busy to mess about filling a container, and perhaps it is less profitable.
Can anyone explain why they might recommend sodium dichloroisocyanurate as a quick and simple way to increase the chlorine level?
Similarly, is there a simple alternative to Sodium Hydrogen Carbonate as an Alkalinity Increaser?
Any feedback or comment appreciated.