If the disinfection system is in order and the filters are working, a hot tub have clear water! 

hot tub Water must never be cloudy!

Therefore, I will explain here, one by one, each point that you can check and improve to make sure everything works.

AGAINST THE GLOBE hot tub WATER

PH value Make the right adjustment to prevent milky clouding of the hot tub water

The pH value in a hot tub should always be between 6.8-7.2, otherwise any disinfectant will be severely limited in its function. hot tub Water becomes cloudy at pH values that deviate 0.5 from 7.0. hot tub Water becomes milky and cloudy. From 1.0 deviation completely milky. Attention: Many PH measuring devices measure incorrectly if the TA value is not correct. This is the most common error in hot tub water treatment.

disinfection against greenish, brownish cloudy hot tub Water

Color in case of insufficient disinfection - green, brown cloudy

chlorine, bromine, active oxygen
It is important that ozone and chlorine/bromine should not be mixed together permanently! Both chlorine/bromine and ozone form free atoms that seek a bond (preferably with carbon = bacteria, algae, etc.) and if both are used at the same time, it can happen that chlorine combines with oxygen instead of the atoms attacking the "bad, living" carbon substances in the water.

• UVC - UV system: Make sure that the glass tube through which the water is irradiated is not fogged up or dirty. This would reduce the radiation and massively reduce the disinfection effect.
• ozone system: Probably the simplest, most efficient and healthiest way hot tub Disinfecting water is easy if you keep a few simple things in mind.
• Disinfection times: Always set the circulation and ozone runtime to 24 hours at the beginning. If the water is perfect or if you rarely use the whirlpool, you can also reduce the times.
• Ozonator: Different ozonators have different ozone production rates. Choose the right ozonator.
• Check whether the installation direction of the ozonator is correct (this is hot tubs with ozonators with diaphragm pumps (important!) and whether it is functioning (usually indicated by a green indicator light).
• Check whether the intake side of the ozonator fits. Often the intake holes are much too small or are covered with fibers to reduce humidity, which quickly stick together. Drill out the intake hole to at least 3mm and remove the piece of fabric on the intake side.
• Ozone addition: This is done using Mazzei injectors that work with the Venturi vacuum system and are connected to the ozonator via a hose line with a check valve.
• Mazzei injector: The choice of the right injector and the right water flow rate at the injector are important here. This can be influenced as follows:
• Prevent alternative backflow possibilities so that as much water as possible from the circulation pump has to pass the injector. Waterfalls or hot water return pipes are often connected to this circuit. Turn off the waterfall when not in use! If possible, turn off the hot water return nozzle as far as possible (this can often be done using a hemisphere in the tip that is placed against the flow)!
• Ensure flow in the ozone line: in some hot tubs Mixing chambers are installed which become dirty or clogged with biofilm over time. Remove these mixing chambers. Ozone is effective for 20 seconds. This means that whether with or without a mixing chamber, the return flow should last at least 20 seconds. This is easy to test by closing the ozone intake and measuring how long it takes until ozone bubbles appear in the pool again after the intake is opened again.
• Check that the check valve in the Mazzei injector is not clogged or stuck with dirt and therefore does not open sufficiently.
• Connecting line ozonator - injector: These two components are connected with a hose line with a check valve.
• Check whether the hose line is fully permeable (not kinked, not contaminated with dirt or nitric acid compounds (which form as a sticky film in the hose during ozone generation))
• Check whether the check valve in the line is fully permeable. Remove, wash and blow through.
• In order to avoid accidental intake of air instead of ozone at the connection points in the pipe, all connection points can also be sealed with insulating tape.

And the most important point against cloudy hot tub Water:

the right one hot tub filter against cloudy hot tub water due to unfiltered suspended solids

ego3 Filter (+++): They are virtually impossible to clog because they do not work like a filter net on paper filters (cartridge filters), but rather according to the swirling principle along free flow channels. They filter out everything down to 1 micrometer and in enormous quantities because the entire 3-dimensional space of the filter balls is available as filter space. In addition, these filter balls are much easier to clean and you can see whether they are clean.

Paper filter (-): When the filters become clogged, the flow rate naturally decreases and the suction on the injector also decreases, and so does the ozone feed. Filters are difficult to clean because sticky substances cannot be removed mechanically, only chemically. It is better to replace the filter completely more often than not. The filter effect is limited by the fiber mesh size. The absorption capacity is limited by the relatively small filter surface. It is almost impossible to determine visually whether the filter has really become clean. Just because the filter is lighter again does not mean that the pores of the filter fabric are clear again.