Expander Station 4（4RS-1） electrode This is particularly necessary when

This is particularly necessary when using salty make-up water because such water causes nuisance chemicals to build up rapidly to toxic levels

and flavor

Your plants need phosphorus and Potassium (P&K) from the earliest days of bloom phase so they can maintain nutrient healthy roots

When the device module is activated by the Hydro-x

Expander Station 4（4RS-1） electrode This is particularly necessary whenThe 4RS 1 is a universal 4 outlet power expansion module. It can be used with any of TrolMasters plug in style device modules to expand the number of devices that can be controlled by the Hydro x. A single 120 240 volt trigger cable on the 4RS 1 connects to your device control module. When the device module is activated by the Hydro x, the 4RS 1 trigger cable will turn on each of the 4 receptacles on the 4RS 1 with a 3 second time delay between each