Caution with DOS reservoirs and NaOH

[Formulator]

Public service announcement - do not use the Apex DOS reservoir for sodium hydroxide if that is your Alk part. I suppose I should have known better…

It did take the better part of a year, but eventually the strong base corroded the silicone seam at the bottom and has started a very slow leak.

 

[Miami Reef]

Polyethylene and polypropylene are 2 materials that are resistant and safe to use with hydroxides.

Vinegar bottles and RO tubing are made of HDPE or LDPE; nothing is chemically better for hydroxide use.