Teach me the A-Z of dosing

[mark]

Depending on make a doser can cost similar to reactor, but there's a huge range for each, specially if consider DIY. Bottles don't need to be huge, a 10 pounder is about 18" high so could fit under a stand, lasted me about 6 months, $20 to refill.

Ca media not much choices but dosing can buy pre-mixed to bulk raw salts.