After researching phosphate reactors I found the main idea being forcing the water through the pellets before allowing it to escape. I saw that others had used a Gatorade bottle, so I bought my husband a Vitaminwater and told him about my idea. He reconfigured my blueprint a little and came up with this amazing thing! It pulls water in through the bottom/side in a way that causes the pellets to circulate before being sucked out through the top by a small pump. And here it is:
https://www.youtube.com/watch?v=I1RKTOhnPDk
https://www.youtube.com/watch?v=I1RKTOhnPDk