Read Ear Slider & water pond treatment

Question
I have recently purchased a pre-formed water pond (200 gallons) for my two Red Ear Slider turtles.  I have a good strong filter system also for it.  The water keeps turning a green color and I am not sure if I can use the water pond water treatment stuff in it without it hurting my turtles.  What is reccommended to keep the water from turning green yet not harmful to my turtles.

Answer
Hello Robin, even with a strong filtration system you will still need to do complete clean outs. Maybe not completely but syphon most the water out and refill with fresh water would help. As long as temperatures stay accurate
Here is some information I clipped from

http://www.fishpondinfo.com/turtles/turpond.htm
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A 200 gallon pond should have at least a 400 gph pump. There should be a good pre-filter like a sponge or floss. This will need to be cleaned as often as it clogs, perhaps daily. The biological filtration should be adequate to keep ammonia and nitrite levels undetectable. An example setup might be a Pondmaster 700 (700 gph pump) in a 200-400 gallon pond. Remember, a 700 gph pump only pumps at 100 gph if it is old or clogged. If you can change about 10-20% of the water every week or two, that should be adequate if you do not have more than one turtle per 50 gallons or so. It is okay to change up to 50% of the water at one time as long as the temperature is close and proper amounts of de-chlorinator are added if one has city water.
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Good luck
Yexalen