What is this? Algae? Dirt? Dead algae?

When you use the traditional way of 'shocking' the pool by raising the chlorine temporarily you only keep it at bay rather than completely eradicating it for good. Algae tends to consume chlorine very quickly so you run out of FC and the algae comes back. Therefore the recurring algae means that you need to maintain SLAM levels of chlorine, which is our suggested method of conquering it for good. A good test kit- preferably the Clearchoice version is what you need to execute the process successfully.

Might I add we are not great fans of pool stores and their testing ;)
 
Australia is a big broad land and you don't say were you are.... some areas have had severe dusty weather and there is even some fires around that could be dropping fine ash .... hard to make a call on algae or dirt without test results and likely an overnight chlorine loss test
Over here Clearchoice labs are the go to people for accurate test kits

The basics of liquid Chlorine and hydrochloric acid (MA to the US) can be found in Bunnings
 
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