Which measuring device is suitable for the Lay-Z-Spa whirlpool? -- F091

Which measuring device is the best way to display the water values in my Lay-Z-Spa whirlpool? Do you have a recommendation?      
I also have a question about problems with my water: as soon as I add SpaBalancer to the water, it takes about 30 minutes for my paper filter to seal. Is there a recommendation here?

Answer:
You can measure the UltraShock and the pH value very well with the PoolLab. For the Ultrashock, use the DPD1 tablets.

Unfortunately, the filters in the Lay-Z-Spa are not very good. Add twice as much Ultrashock to the water and 30 percent less SpaBalancer Basic. If that doesn't help, put three times as much UltraShock in the water and 50 percent less SpaBalancer Basic. This will relieve the strain on the filters.  

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