Reef Tank Ph Controller on Co2 Scrubber and Kalk Reactor

Quick overview on how I set up my reef tank Ph control

Some items I use:
Milwaukee Instruments MC122US pH Controller with Hi/Low Range Alarm, 2 Point Manual Calibration, 0.0 to 14.0 pH Range : https://www.amazon.com/dp/B01NCQUSSJ?...

1/2" DN15 110-230VAC Normally Closed Stainless Steel 304/CF8 Motorized Electrical Ball Valve With U.S. Plug: https://www.amazon.com/gp/product/B00...

IceCap Kalk Mixing Reactor Medium (OPEN BOX): https://store.coralvue.com/icecap-kal...

HiLetgo 2pcs Water Pump 240L/H DC 12V 4.2W Micro Brushless Pump: https://www.amazon.com/gp/product/B07...

HiLetgo 12V 1 Channel Relay Module with Optocoupler Isolation Support High or Low Level Trigger: https://www.amazon.com/gp/product/B00...