If you use an RO
unit to fill the tank just run the good RO
water line into the tank. Hold i with a clothing pin.
If its a great distance from your RO
unit to your tank then you may be destined to do the 'bucket burgade'. If you get a PH
like a mxijet1200 and 7 or 8' of 1/2" IOD hose you can pump the water from the bucket to your tank saving the heavy lifting component.
Others do the inital filling of the tank with tapwater thats been conditioned. THen do their first mixing of salt in the tank (void of everything but water and PH
's and heater). Once salinity is up to snuff you can add your LR
or anything else.