Originally Posted by carey
You can get phosphates from the liquid they freeze the food in!
That's definately true. Here's a test I did some time ago:
16oz container of RO
0ppm, phosphate 0.00ppm):
A single cube of frozen mysis shrimp added to this RO
water and thaws:
10 minutes later I test a water sample from the cup using a phosphate photometer (result displayed as mg
/L or ppm
). Phosphate contained in the frozen food has leached out while thawing in the RO
Fortunately, were this cube added directly into the tank without rinsing, the phosphate is diluted down by the water volume of the tank (but is still available for nuisance algae & cyano
utilization), but feeding is a recurring event.
I've also had PO4
readings when doing a similar test with flake and pellets.