This is a two bottle test not a two plus powder that the Tetra kit is. It does take agitating and there can be some aggrevation as the cap on the test tube doesn't always prevent spattering, a finger over the cap on the tube plus wrap it loosely in some paper toweling to prevent showers helps. You do have to agitate one bottle for 30 seconds before adding the drops, there must be something to put into suspension that can settle out. Then you have to agitate the tube for a minute, again, must be to allow something to react that's suspended in that second bottle chemical. It also has a 10 min 'reaction time'.Test results are spot on comparing the Tetra (with two fluids and zinc powder) and simpler IMO to perform.
Rating:
[5 of 5 Stars!]