Here one reply i just received.
"Let reefers send you their latest test results for calcium, magnesium and alkalinity and you send them what they need to get their values to target and instructions on how to do that AND maintain them at target after. Supply them with enough for 3 months (estimate based on usage and stock) and use this as a "dosing trial" so they get to see what their tank can look like when ca, mg, alk, and pH are maintained at these levels WITH a small discount on their next order if they keep up with dosing your products when the trial batch runs out"
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