brs doser

Seven Bulk Reef Supply 1.1 Lpm dosing pumps. $25 per. Must purchase at least 3. Work great with Apex or any timer system. All in great condition. Was dosing elements so not a ton of hrs on any of them. Will Ship for free within reason if you buy them all. These are bulletproof "dumb" pumps...

So I'm using a classic Apex system with an EB 8 and a BRS doser 1.1 ml. I slowly add kalk throughout the day and it's at a constant rate every hour. At night the tank will drop in PH even though I'm dosing kalk. So far Ive got my PH up to 8.2 and it will drop down to about 7.98 when the lights...