I'm assuming that you want clean up your block after using a while. DON'T USE TOILET BOWL CLEANER! Thats for cleaning you what out of a crapper. Before you do anything make sure you it really needs it. Also do all the flushing described on your complete cooling sysem - block, res, pump and rad.
To kill algae use good old fashioned bleach. Dump the old coolant and put about 1/4 cup/30cc in your system, top off with tap water and let it circulate for a while. Then flush with tap water until it doesn't smell like bleach any more and no bits of crap come out.
I don't advise using the bleach in your normal coolant mix. I don't know how the chlorine in the bleach will react with copper/aluminum over time.
If you're trying to clean out the results of corrosion use some automotive cooling system flush - make sure the label says it is safe for copper and aluminium. Try to find the liquid kind and figure out from the directions how much to use. Top off the system with hot (boiling if you can) water let it circulate for a while. Flush the same as for bleach, only do it 2 times longer. You don't want any of this stuff to be mixed with your normal coolant mix.
You don't have to both kinds of cleaning. Use bleach for algae and the coolant system flush will take care of both the alge and corrosion. Fill the system with distilled water and Water Wetter and you shouldn't have any problems.
If you do have corrosion (I don't know what components went into your cooling system except the DD maze 2 - Copper) get a copper rad. Over time continued corrosion will lead to leaks. Then there is a good chance the whole system will turn into a POS. Then you can use toilet bowl cleaner because it won't matter anymore!
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