Discussion on chemicals

[Mark_C]

I was planning to set up a reactor, but was curious on what cleaning items might work in unison or nullify each other.
Got me to wondering things like...
Should I run Phosguard with ferric oxide?
If I run carbon and ferric oxide, should I use Chemi-pure?

Here's a list of a few things I have:
Carbon
Chemi-pure
Phosguard
Ferric Oxide

Assume we're all dosing Ca/Alk/Mg or All-for-Reef, we're using skimmers, and we're changing socks/media regularly.

What chemical combos are best for keeping the bad stuff in check?
What combos do you guys with the big killer tanks run?

 

[MadReefer]

I just dose calc, alk mag and recently carbon dose using vodka.
What bad stuff are you concerned about?

 

[Mark_C]

Just a general question on keeping water clean.
Wondering what combos everyone uses.

 

[iTzJu]

Currently, I only use carbon (in a bag) and GFO (in a small reactor) to keep PO₄ in check. The carbon is mainly for general water clarity and safety. Beyond that, the focus is just on maintaining the big three parameters (alkalinity, calcium, magnesium).

I used to use Chemi-Pure, but it’s essentially a mix of DI resin, carbon, and GFO, depending on the specific type you get. Honestly, a DIY version works just as well, especially without the ion exchange resin, which doesn’t last long in saltwater environments anyway.

For controlling PO₄, I occasionally use lanthanum chloride. It’s highly effective for reducing phosphate levels quickly, but you need to be careful with dosing. Always dose it slowly in a high-flow area or through a filter sock to catch any precipitate. It’s not something I rely on regularly but can be useful for occasional adjustments.

As for PhosGuard, since it’s aluminum-based, it can leach aluminum into the tank. If you don’t notice any ill effects, it’s fine to use, but I personally prefer GFO as a safer alternative for phosphate control