To remove or not to remove metals

[surfacefeeder]

I know I have to add it. Just wondering if its better to add it now or when the conversion is done or maybe it doesnt matter. Thought I would ask first better safe then sorry. I have a 27 ft agp.

[waterbear]

Add it now, the presence of metals in the water can cause the water to color and will consume some of the chlorine you are putting in to kill the biguinde. Keep adding sequesterant with each new refill of water.