I have been using Zeo for a little over a year now. The initial cost is kinda pricey but depending on the size of tank you have, a full bottle of the supplements does last a long time. Dosing is daily but does not really take long at all. Maybe 2 minutes a day. The problem I see in the Philippines is there may not be a Zeo dealer. One of the products which is ZeoBac needs to be refridgerated. If you order it from overseas, it must be package in some cooler and sent for a 2 day at the most delivery. Anyways, Zeovit.com will tell you all you need to know. I took some pics of my tank when I started zeo and another after its 1 year anniversary.
[img][img]http://img.photobucket.com/albums/v485/Deuce67/Jan.jpg[/img]
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The first pic was taken on Jan 18 06 and the second was Jan 19 07.
It works well IMO.