Be very weary of relying on a system where you MUST run a continuous fill line and pump out line inside someones home. Once a hose is connected from a machine to a sink and PRESSURIZED, a lot can go wrong. Sink connections can develop leaks, hoses can pop off under pressure especially when moving the machine, pump out lines can work their way out of whatever drain you placed them etc., all while you are oblivious to a developing issue because your 3 rooms away and can't hear shit because your machine is wailing away. Do not underestimate sink pressure. It's the same pressure in a garden hose that can throw a stream 30 feet, now inside someones home.
Having to always set up near a water source also limits your mobility and range which can be a problem within certain layouts. You will find yourself having to run a lot more hose indoors because you can't get your machine as close as you want to.
I have also found that continuous pump out filters on most porty's can be undersized and easily clogged. Having to troubleshoot a portable with a live water source to it is a pain in the ass. There are also a lot of new sinks out there with odd adapters that do not seat correctly. Then what are you gonna do??
I have not autofilled on a residential job in a long time, and I don't plan to. I do sometimes pump-out, which is a lot safer.
A true Porty Hacks best friend is a 5 gallon bucket. Learn to sling one like a pro. The ideal hookup, if possible, is to hook up in a bathroom that has a tub in close proximity. Make yourself a 5 foot lead hose, and fill like this......
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This allows you to SAFELY fill your bucket without having to stand there watching it. Set the flow rate according to your estimated return time needing more water and keep moving. This can cut serious time off many jobs an is the safest method of dealing with the dangers of water inside someone else's home.
The few.....The proud......The Porty-Hack.