I believe my math is Correct
From the GHL Website "The GHL Doser Maxi is the perfect dosing device for automatic water changes, .... Average lifetime: 5000 hours for the motor, 800 hours for the pump head."
If your doing 8 Gallons a day. that is 30283.3 ML, which is a average of 311 ML a minute would be you would need 97 Minutes or 1.5 Hours would be spent.
You would get 533 Days before you would need to replace a Doser Head 3,333 Days before you would replace the Motor.
Thank you Ditto
Your math is perfect!
Hmm, based on your math Letermeter is more reliable pump... Wonder what kind of motor they use?