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→Required materials
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==Required materials==
*Distilled water for at least the sodium bisulfate solution and for final rinsing.
*[https://en.wikipedia.org/wiki/Sodium_bisulfate sodium bisulfate] (NaHSO4), aka sodium hydrogen sulfate. Used to lower pH in swimming pools. Needs to be at least 90% active ingredient.
*Optionally [https://en.wikipedia.org/wiki/Sodium_Hydroxide sodium hydroxide]. (NaOH) aka lye or caustic soda. Has various household uses.
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*Aluminum or lead for the [[cathode]] (connected to the DC supply negative).
*The aluminum piece to anodize.<ref name="obs"/>
==Preparation==
*To clean and prepare the aluminum surface, make a 2% solution of sodium hydroxide. 4 grams of in 196 ml. of water, or 1 teaspoon in ¾ cup water, distilled water is better. This measurement is not critical. Mix well with plastic or wood implement.
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