On the light side...
- Thread starter Piolin
- Start date
But you could claim there are some that turn it yellow or pink. Add a drop of OTO or DPD regent 
Of course you need to be pretty sure because obviously it will turn if there is any chlorine in the water.
WARNING: Adding reagents to your pool is generally not recommended.
Of course you need to be pretty sure because obviously it will turn if there is any chlorine in the water.
WARNING: Adding reagents to your pool is generally not recommended.
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