Doug,
If your having troubles maintaining Ca and can't afford or justify a reactor on a small system such as mine then try Kent's Liquid Reactor.
This stuff works great and is Ionically balenced so you don't need to play the teeter totter games.
I just started using it last month as I was no longer able to keep up to the Ca demands using kalkwasser alone. Long term use of kalkwasser can lead to sandbed binding and other things.
And yes it is easy and harmful to overdose kalkwasser or any additive for that matter, which can cause serious swings in Ph and Alkilinty and also throw your system out of whack on the chemistry scale.
I dose LR once a week and even at 3mls I have to be careful and alway's blend with top off.
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