What should I do to maintain my Berkey system?

Wash lower box / chamber every month with soapy dishwater. (This is NOT necessary but good to keep the unit clean) It's ok too to was the whole unit every 6-12 months when the filters are cleaned too.
In areas with hard water, where calcium scale may build up on spigot & chambers after long and heavy use.
To remove that, soak parts in vinegar or a mix of vinegar and water for about 15-20 minutes...
Wipe away calcium scale with a dishwasher pad or soft brush then wash with soapy dishwater and rinse the whole Berkey System with warm water (Not hot water).

/* if no javascript: get back ATC button */ body:not(.spo-loaded) [data-shopify="payment-button"], body:not(.spo-loaded).template-product #AddToCart, body:not(.spo-loaded).template-product form[action="/cart/add"] [type=submit], body:not(.spo-loaded).template-collection form[action="/cart/add"] [type=submit], body:not(.spo-loaded).template-index form[action="/cart/add"] [type=submit], body:not(.spo-loaded) form[action="/cart/add"] [type=submit] {opacity: 1; pointer-events: all} body:not(.spo-loaded) form[action^="/cart"]:not([action^="/cart/add"]):not(#currency_form) button, body:not(.spo-loaded) form[action^="/cart"]:not([action^="/cart/add"]):not(#currency_form) input[type="submit"], body:not(.spo-loaded) form[action^="/cart"]:not([action^="/cart/add"]):not(#currency_form) input[type="button"], body:not(.spo-loaded) [name="checkout"], body:not(.spo-loaded) [name="goto_pp"], body:not(.spo-loaded) [name="goto_amazon_payments"] {opacity: 1; pointer-events: all}