RO/DI question

just picked up a pure flowII by coralife, this is the 50 gal/day system. I tested the unit today and im getting 1 cup of RO water to every 8 cups of waste water. Is this typical for this brand or is somthing wrong with the unit. All the prefilters are brand new right out of the box. I understand its a little cold out and that may cause it to slow down a bit, but im just wondering if 8:1 is a decent ratio
 
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