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Here is my "Temporary" rig that we built last fall.  I'm Calling it the TLDS,  (Temproary Love distribution system)  Temporary because i know updates are necessary and the barrell will someday be replaced with a tank.  (tank, trailer, permanent hose reels, etc.) The barrell was cheep and seems to work well for the few jobs we have done so far.   We are considering making a float type device which will show us the level in the tank.  Having the ground man go look at the tank level is a PITA.

Using a 5850 Delavan pump, 5/8 Kuri-tech hose, (bought from Lori at PWP) and made our own manifold and valve system.  Made our own nozzles with info we found here.
The manifold is a simple design which allows us to transer SH to the barell, or draw chemical from another container as well as draw clean water for pump rinsing.

This skid needs a paint job,  but it can easily be lifted in and out of the truck by two guys when empty (**Note,  it is a great idea to put it  in the truck before filling the barrell, unless Hercules is your partner)
This skid unit works ok for us now since wer are just part time roof cleaners and pressure washers,  but wanting  to expand.