Bubble Blaster the new water blaster pumps can be run internally or externally.  The new pumps are reported to have zero start up issues and come with a 3 year warranty.  The pump will also have the upgraded silicone nitride shaft and bearings. Calcium will not adhere to this material.

Comes with unions in US sizes and barb fittings.

HY16000W - 180watts Max Flow = 4300gph

WB2000 - 3/4" in, 1/2" out
WB3000 - 1" in, 3/4" out
WB5000/7000/10000/ - 1.25" in, 1" out
WB12500/16000 - 1.25" in and out