The advanced, iterative pressure loss/head loss calculations associated with Squirt are what makes Squirt unique in the onsite industry; no other pressurized drainfield design program on the market today offers the same level of performance and reliability when it comes to accurately calculating pressure losses throughout the ENTIRE system.  Most competing programs merely calculate initial pressure losses and multiply those losses by the number of fittings rather than actually calculating the SPECIFIC losses associated with EACH fitting.  Particularly on large-scale drainfields  and/or more complex drainfield configurations, sloped systems, etc., Squirt's accuracy is unmatched and is a critical reason so many engineers, system designers and regulatory professionals rely on Squirt over any other pump selection program.