carbon by removing heavy metal and especially chlorine will help prolong the lifespan of the DI resin. Which is why for a 5 stage RO/DI filter, there is two carbon block / filter before the mebrane and DI .
Welcome to the salty side. I bet there is many diver like you that just can't get enough and decide to bring the sea home. Do some read up on the forum and you will be able to find alot of information or post your question here so that others can help. Yes it is possible to have a 6x2x2 in a hdb . Sent from Singapore Reef Club mobile app