Something is consuming your chlorine. You should only need one scoop of the powder, two at most and it then turns pink. If two doesn't do it, you have no free chlorine.
You are going to need a lot of chlorine. If you have a pool store that sells 5 gallon carboys of 12.5% liquid chlorine, I'd get a couple of those--and a nozzle (about another 5 bucks). You didn't say how many gallons your pool is but you need to hammer it and calculate how much LC you need to shock it. I think your shock level is 20ppm, but if you cannot reach that, you need more chlorine.
Let's start with that.
Don't go to a pool store for advice or they'll start loading you up with "shock" which will raise your CH or lower your pH and raise your CYA. Then they'll try to sell you phosphate remover. What you need is chlorine and lots of it, either as bleach or Liquid Chlorine (same thing, only stronger).
Carl
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