On one of the other threads, Cloudy Water Hazy Water and Algae!, I read,Definitely a leading contender in the <"World's most Expensive water"> contest.
'I actually took from the cabinet flora grow colombo plant fertiliser. And I read the label on it and it says agent chelators used: EDTA, DTPA On instruction says 1 pump per 5 litres so I added 3 pumps right now for try.'
That would equate to 46 pumps for my 230l, I don't think my finger or wallet could keep up with that.