Besides weekly water changes ,which is the best cost effective way to keep down nitrates and phospates.vodka dosing, gfo,bio beads,or lantium chloride.
which is the best cost effective way to skin a cat..... first catch the cat....lol.
but seriously, i've read this question with emphasis on cost effectiveness.
never used lanthanum chloride so i can't comment on risks and benefits on that method....but it may be the cheapest way to implement.
vodka works well if you're very consistent on the daily dosing....which for a busy(lazy) person like me, was not something i could keep up with. never stuck with it to really see the long term effect. cheap vodka goes a long way.
gfo works but i hate changing it out every 2-4 weeks, it leaves rusty color residue everywhere. gfo ain't cheap.
biopellets works very well for me....been running it for over 2 years. i only need to refill and maintain the reactor about every 6 months....perfect for a busy ...ahem...lazy...reefer like me.
it's slow to show initial effectiveness but once it's set, my skimmer works like a sh*t factory....producing some really nasty stinky cruddy skimmate.....lol only a reefer could possibly appreciate that.
i use the brs biopellets and for my 300 gal. system, the 1/2 gal size would last me about a year. so $80-90/yr or about 7-8 bucks a month. yes there were the initial costs of the reactor...super reef octopus br-140 @ $199, a marineland utility pump 5500 @ $129, valve and hoses @ $15 or so.
this may be the costliest method with the initial equipment expense but it's the key to success with biopellets, the right reactor and a strong pump to run it. i have tried several other reactors and pumps but find them to be lacking until this combination.
it may appear not to be as cost effective as other methods but if i factor in the "price of personal time" spent implementing, fiddling, forgetting, worrying, etc. it's the best cost effective method for me.:wink1: