http://katadynch.vs31.snowflakehosting.ch/fileadmin/user_upload/katadyn_products/Downloads/Manual_Katadyn_Survivor06_EN.pdf

It's less "rigourous" than larger units, but you can't ignore it.

An excerpt from above:

• During prolonged emergency use, pump the unit for at least 10 minutes each day to keep seawater
from stagnating inside the unit.
• If the unit will not be used again for several days, remove any accessible seawater from it. To
do so, remove the intake strainer and hose from the feed water. Turn the unit upside down, and
pump the handle up and down normally until water stops coming out.
• After the unit has been used, flush the membrane with membrane preservative before storing it
again. This will prevent the growth of bacteria inside the unit. Refer to “Storage” below.
• If the feedwater has an high bacteria content, use membrane preservative daily.
• Store the membrane preservative in a dry, ventilated area.