How to clean spots/rust off 304 Stainless Steel.
The chromium in stainless steel when exposed to oxygen in the atmosphere forms a thin invisible layer called chromium oxide. This invisible layer covering the entire surface gives stainless steel its ability to resist stains and rust - However if this layer gets damaged, it can cause spots/rust.
How to Clean Spots/Rust on your Gravity System
The term "Stainless Steel" is a slightly misleading name. A more accurate description would be "Harder to Stain Steel". Whilst the gravity systems is made from 304 stainless steel, the largest single component of this stainless steel is still steel and steel can potentially corrode or rust over time if not looked after properly, if it exposed to harsh chemicals/contaminants, if the steel rubs against the steel, High humidity or high salinity environments such as sea water (we do not recommend salt water in these units or our filters)
The chromium in stainless steel when exposed to oxygen in the atmosphere forms a thin invisible layer called chromium oxide. This invisible layer covering the entire surface gives stainless steel its ability to resist stains and rust.
However, if this layer gets damaged, rust can form on the surface at the point of that damage. We rarely hear of rusting issues, but the good news is that with a little cleaning and care the chromium oxide layer can be self-healing. But we would suggest keeping a close eye on it and perhaps cleaning it more often (as per the guidelines below).
Cleaning 304 Stainless Steel
Take care to not damage the chromium oxide layer by avoiding the use of abrasive cleaners that contain chlorides (fluorine, chlorine, bromine, iodine, etc.). Cleaners containing alcohol, ammonia or mineral spirits can also damage the protective layer.
You should only use warm water and a tiny amount of washing up liquid on a cloth to clean your units. Make sure you fully rinse the soap suds off with warm water, and dry thoroughly.
Do not use steel wool or steel brushes.
Removal of oxidized stains and even ?surface rust? can be done by using a paste made from baking soda and water. If using baking soda and water, make sure the baking soda is dissolved as if it is grainy, it could do further damage. *Use a clean cloth or soft bristle brush (old tooth brush), rub the baking soda water in the direction of the grain over the ?stains/surface rust?. This may take a little effort. Once cleaned, rinse with clean warm water and a clean soft cloth and dry thoroughly.
Be careful not to scratch the protective layer further which can cause damage and spots later on. Stainless steel and the chromium oxide layer actually thrive on proper regular cleaning. Therefore you should clean the unit every couple of days, and all water should be emptied from the unit at night before refilling.
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