When cycling through the first bottle of Part A in the PipeFuze Fluid Set, there are smaller particulates along with the larger ones that get drawn into the area where the crack occurs. This is a natural process where the tiny pieces escape as the larger pieces begin to fill the space. As the fluid continues to circulate, and the larger particulates fill the hole, the smaller pieces will fill in between the larger pieces, ultimately, forming a complete blockage and stopping the water loss.
Depending on the size of the separation where water is escaping, and the flow of water moving through it, smaller pieces might begin to diminish in volume as the fluid works to do its job. Smaller pieces will always get drawn into the crack first. This is why we recommend performing a second low-pressure test on the pipe after a couple of hours, to see if it’s holding that pressure; meaning that the water has stopped flowing through the crack. If it has, it’s time to administer Part B. If the pressure loss has reduced to a significantly smaller amount, but still persists, continue to cycle Part A through the pipe – or even add a second bottle.
By adding a second bottle, you are allowing for more of the smaller bits to circulate and continue to fill the smaller spaces where the smaller amount of pressure is still escaping. If adding a second bottle isn’t your choice, try lifting the pump and make sure the bottom is cleared off, and is able to pull in all the available particulates still in the bucket. Run the system for another hour and perform another pressure drop test to see that its holding.