There could be multiple reasons causing this: a clogged filter, a low water level, an air lock, or broken jets. A clogged filter is a dirty filter. If you are experiencing a weak or low water flow out of your jets, this could mean your filter needs either cleaning or a replacement of a new filter. Check your water level. If your water level falls below the skimmer level, (where the micro filter is placed) then you could have issues with the strength of your water flow. There is an air lock. This means that air could have gotten into the plumbing line and is blocking water from flowing properly. This can happen when you drain, refill, and clean your hot tub water. If your jets do not work after you do this, there may be an air lock. One way to fix this is opening your valves and turning your jets on low for 10-20 seconds then on high for 10-20 seconds and repeat until the flow returns to normal. If this nor any other methods above do not work, you can call a professional to come help. Another possibility is that your jets are broken. Check all nozzles to see if any debris is blocking water flow. If jets appear to be worn out, this could also mean you need to replace your jets.