Problems With Algae Phosphates May Be Feeding The Algae. Keep phosphate levels in check to prevent algae breakouts! Packaged in a convenient and sturdy plastic bottle the AquaChek Phosphate kit includes testing powder pillows sampling vial directions and color chart. The test gives accurate results after only 60-seconds and measures phosphate from 0 to 1000 parts per billion. 20 tests per bottle. Only available in US not for resale in Canada.