Making more of it

Unusually easy to scale in the vessel and unusually hard to scale at the bottle.

The constraint is filling

Nothing is setting, curing or cooling, so a batch can be held while you fill.

Which means the ceiling is not the chemistry. It is how many bottles per hour you can fill, cap, seal and label.

Bigger batches are easy

Doubling a batch mostly means a bigger vessel and a stirrer that can move it.

Two things to watch: mixing has to reach the whole volume, and pH adjustment on a large batch needs a more dilute adjuster and more patience.

And weight. Water is a kilogram a liter, so a 200 liter batch is a pump-and-plumbing problem rather than a lifting one.

Filling is where the hours are

A gravity or piston filler is the first real equipment purchase and it transforms throughput.

Then a capper with consistent torque, then an induction sealer, then a label applicator.

Time your own process first: minutes per hundred bottles for filling, capping, sealing and labeling. Buy against the biggest number, which is usually labeling.

The step change

Somewhere in the low thousands of bottles per run, hand filling stops scaling however well organized you are.

At that point the options are a semi-automatic line or a co-packer, and in this category the co-packer is more attractive than in most, because they also solve the raw material minimum problem.

What does not work is pushing hand filling past it: fill weights drift, torque becomes inconsistent and leaks start, which is the failure customers see.

References