What is the best easiest way to reintroduce lost mineral's etc...
You don't want to introduce those in your water. That's why you got an RO
filter - to get rid of the minerals, nitrate, phosphate, chlorine, flouride, heavy metals, etc., etc. from your source water. That way when you mix your SW
you are adding trace elements and salt in a measured and controlled manner.
Not to contradict Kevin 8O but I would dose calcium if you are unable to maintain a high level of Ca
to encourage encrusting coraline algae and Halimeda to grow. Get a Ca
test kit and measure it, it's the only way to know where you're at.