I've got no water coming thru the side jets in my pool, even though water is pouring through the jacuzzi jets. The jacuzzi is all part of the pool.

leak somewhere,take it apart and lube gaskets with vaseline

if your tub was not used for a bit of time your gonn have to pop open the sides and have a look around , Hoses that go nowhere or loose looking are what your looking for, plus water leaks , i did have a problem once with squirels getting inside one and eating hoses off ,made nest inside and generally messed things up inside it but any wild animal could do the same thing

black slime come from not using regularly..fill jacuzzi and pour a cup of dishwasher detergent and turn jacuzzi on for a while..

check the face of the jet trim to make sure it is turned on. most jets today turn clockwise and counter clockwise to turn the water on/off on each jet.

The jets will run while in the filtration / heating mode. If the spa is in the middle of the filtration cycle, the jets will stay on until the cycle time runs out. So, if the spa jets are on during this time, they are on for the full duration, 2-6 hours every 12. You can cycle the jet button to high, but when you try to turn them off, they will just go back on low.

you probably have a check valve (back flow preventer) on the line that supplies water to the spa when the pool is filtering as normal. Your check valve may have some debris in it or the seal inside may have failed allowing the water to drain into the pool when the system is off. You should see a valve on the return line that splits off from the pool return line on your system. There are several different check valves on the market, some have a clear lid that you can inspect without taking it apart. Some of them cannot be taken apart. Your challenge will be to find the check valve, then try to check to see it debris may be holding it partly open or it the rubber seal inside is damaged or missing. I hope this helps.

I agree it sounds like a check valve. if the water in the pool matches the water level in the spa, or drains all the way (depending on how far the spa is raised) then it is the valve before the pump, but if it goes down to the jets (and not any further) then it is a check valve or valve on the retun side of the plumbing ( after heater or chlorinator).

sounds like the rubber seals are going bad, does it recomend to run cascade thru the jets? this might be harmful to the gaskets and the pump, you maight want to disconnect the hose and flush out the tubes going around the tub, but I would call jacuzzi and ask them if this is good to run thru there, thye might be able to help you with the gaskets, questions over the phone do not cost you, call them, ask for repairs section good luck

try turning off the 5 previous jets in order to see if there is enough water flow to get to the last jet.

the jet are pushed by the impeller (it's like a fan blade) run by a moter water is pushed through the plumbing and out the jet head . when you open an air valve air is mixed in .