You may need to look into repairing or replacing your multiport -- you shouldn't have lost any more water than normal, while on recirculate.
Follow Watermom's caution - it's best if you can avoid having to shock a pool with metal problems. You can add dichlor or bleach via the skimmer, which will tend to drop out metals onto the filter.
Also, you need to keep HEDP on hand, and add a small (maybe 1/8 normal) dose TOGETHER with the fill water, when ever you add water. If you have a CuLator bag, it would be good if you can put it back in, for at least a couple of days after each water addition.
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