Firstcall Photographic

Bellini Sodium Hexametaphosphate Calgon - 500g

Bellini Sodium Hexametaphosphate Calgon - 500g - Main image
$22.2 $30 In stock

Category: Film & Film Processing Raw Chemicals

Sodium Hexametaphosphate or Calgon, has the property of holding calcium and magnesium salts in solution, even when boiling, making it a great water softner.


Sometimes called Graham's Salt, Polyphosphatesodium salt, Sodium polyphosphate or


Calgon; but please note that the proprietry Calgon is not always the same formula as Sodium Hexametaphosphate.


The molecular formula is: Na6O18P6.

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Customer Reviews (4.8 / 5 · 5 reviews)

Ryan ★★★★★

Finally found a reliable source for a water softener that actually works in my darkroom. This 500g batch of sodium hexametaphosphate handles the hard water deposits perfectly, no more spots on my dried film.

Harper X. ★★★★★

Been mixing this into my developer wash water and the difference is night and day - no more chalky residue on my prints even after a hard-water rinse. A 500g jar goes a long way too since a tiny pinch handles a whole batch.

Sebastian P. ★★★★★

Finally got consistent prints without those awful water spots ruining the final wash. A pinch of this stuff in my final rinse completely softened the hard tap water I've been battling. It's a simple fix that's made a huge difference for my film development.

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