GHL Doser 2 with wifi and 4 pumps
I use this dosing system for alkalinity magnesium and calcium the 4th pump was for auto top off which has included 2 auto top off sensors worked great as ATO includes extra dosing tubes
$300
]https://uploads.tapatalk-cdn.com/
20170813/95bcf8f0d6f0cbce834e4b12871c86d0.jpg[/IMG]