You will get a massively different and higher level of automation with this system as explained above.
You have two choices the first being the profiLux stand alone doser pictured here. this has a built in controller
The picture shows the fully configured 4 pump version. These units are available in 1-2-3-4 pump versions. And the 1-2-3 can all have pumps added at anytime by removing the blank plate.
Cost of 3 stage with built in controller as shown above is $469.00
Or you can go for the other option which has proven so popular
GHL 3 stage dosing pump
GHL profiLux aquatic controller
GHL Temp probe
pH probe
RS232 cable
MRSP $659
This is so popular becuase it also gives you the GHL profiLux also, which then expands you possibilites even further