All of my chickens have had very watery, splashy pooh for weeks now. What could this be?

[algopurple]

I have 33 adults ranging from 1-5 years old. Back in Nov. they went from 20+ eggs a day to 1-2 a day. Figured it was from the temps. dropping, shorter days, and some of them seemed to be molting. Their production has picked up to about a dozen a day now but I have noticed for a few weeks now that they are all having splahy, watery poop. Almost never see solids anymore. They eat only layer pellets and table scraps when available. They seem normal in behavior but I figure they can only go so long like this befor their health starts to suffer. Whenever I walk in the hen house at night to check on them and get any late eggs, I can hear splashing constantly.
Anyone have any idea what this could be and what I need to treat it?

 

[CMV]

Have you wormed them lately?

 

[algopurple]

Didn't think worms would make them like that, but no not lately.

 

[ChickensAreSweet]

I have seen that with worms. Have they been losing weight?

Here is some info. in case you need it: some vets offer a fecal test for worms for a small fee. Some folks like to just worm them without checking via test. Be aware that some wormers require that you toss the eggs (egg withdrawal period) for a specified time.

 

[algopurple]

They seem fine and I have not noticed any weight loss. Even the ones that looked like they were molting are now looking really pretty.
I have heard of some wormers that did not require that the eggs be tossed. Any idea where I could fine one like that?

 

[ChickensAreSweet]

The UK has one but I don't know if it is available here.
http://poultrykeeper.com/poultry-medication/poultry-medication/flubenvet-used-for-worming.html