Bulk water conditioner?

[TattdxMama]

I have three tanks - 55 gallon, 29 gallon, and 15 gallon. I'm going through quite a bit of water conditioner and was wondering if anyone had any suggestions for a water conditioner sold in bulk? I've been looking around, only seen one product on Wal-Mart.com but wanted to see if anyone knew of something better.
Thanks!

[PassengerTN]

I feel like I have seen a DIY video on YouTube


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[PassengerTN]

Found it

http://youtu.be/9du-Z_RKQTw


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[Clayman]

Seachem safe. It's like prime but powdered and concentrated.

[coralbandit]

I use safe for my 600 gallons of freshwater.
Great product.
This is what is in the link from hensleyjk(wow!);
Sodium Thiosulfate
For most prime is good enough and stays fresh longer then other products.

[threnjen]

If you want pre-mixed Prime, it does come in larger bulk containers