Agree with Morich. The simple answer is to squirt enough bleach to get 5 ppm into the filler hose before filling the tanks. This will assure that the second tank will be sanitized before the first. The second tank will have a stronger solution than the first but the first tank will have a longer exposure time before use. If you can smell bleach in the water exiting the sink faucet, it's too much bleach.
Keep in mind:
Bleach sanitizes the water from most organics, not metals or some pathogens
the effectiveness of bleach depends on time of contact with the water as well as the strength
bleach deteriorates with time, it becomes less potent
bleach can (rarely) contaminate the water, particularly if alum is present in the water supply
Most common contamination problems that bleach treats originate with mammals; e-coli, giardia, samonella and some forms of algae.
Keeping the black water away from the drinking water prevents many contamination problems. Care at RV dump sites and sanitary dumping practices as well as care in handling and storing hoses and equipment is important.
When boon-docking, a 3-5 micron filter in addition to the bleach is useful when filling from lakes or streams. Although the bleach will sanitize the organics with time, larger organisms such as algea and "beaver fever" will immediately be trapped in the filer media
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