Keeping mildew out of drinker

[LeenyMarie47]

I purchased this pvc drinker in hopes of increasing the amount of time between water changes. I read that apple cider vinegar would help keep it from mildewing. I added a couple of teaspoons when I filled it up and it's gross less than a week later. I'm thinking that being in Florida with super hot humid days probably isn't helping. Any ideas on how to keep it cleaner longer?

http://m.ebay.com/itm/RITE-FARM-PRO...NT-COOP-RUN-/131724845964?nav=WATCHING_ACTIVE

 

[Pendragonz]

With the heat being what it is I think I would be using like 2Tsp per gallon. See if that helps. It's the amount I use in Arkansas.

 

[Kasilofchrisn]

I use one tablespoon per gallon of Bragg brand acv.
You need the acv. With the mother in it.
My three gallon starts to get slimy at ~ a week.
Not bad but I always clean it at or before then anyway.

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