Pool in the garden? - Need inspiration!

With us, it hasn't tipped. You can tell by the water temperature whether it is standing in the sun on the sunny [Main] or in the fresh [Rhön].
Satisfied with the balls? A friend threw them out again and went back to sand.

So I don’t understand what is insufficient about the sand filter pump.
The pool is 4x2mx1m filled to about 90%, so roughly 7 cubic meters of water.
Pump capacity 3 cubic meters per hour
Sand 8.5 KG

Take a look at the pump curve. The 3m3 is only achieved without back pressure. So with piping and since it’s positioned lower, it’s significantly less. Even if it runs 24 hours, it is actually too little. The amount of sand is too low to form a stable filter bed. That’s why the pump is also so weak...

2 hours per day is far too little. Your water might not have turned green, but the water quality was most likely pretty bad.

Every summer, pool forums are full of people seeking help with above-ground pools. Usually, eventually a larger filtration system with a suitable pump is installed. And the problems disappear.

With us, it hasn't failed. You can tell by the water temperature whether it's standing in the sun at a sunny Main or in the fresh Rhön.
Happy with the balls? An acquaintance threw them out again and went back to sand.

Well, we are super satisfied. They filter really well, and at the end of the season they go somewhat rinsed into the washing machine and come out like new.

Take a look at the pump diagram. The 3m3. It only delivers that without back pressure. So with piping and since it's located deeper, it's significantly less. Even if it runs 24h, it's actually too little. The amount of sand is too small to form a stable filter bed. That's why the pump is so weak...

2 hours per day is way too little. Your water may not have turned green, but the water values were almost certainly poor.

Every summer, pool forums are full of people seeking help with above-ground pools. Usually, eventually, a larger filter system with a suitable pump is installed. And then the problems are gone.

The water values were completely fine toward the end. Not perfect, but they don't have to be. But since my kids also liked to drink from puddles, I'm pretty relaxed about such things. It must not freak out completely and must not turn green.

. After the water values, which the test strip shows, were still okay at the end of the season, it is fine for me and somehow enough filtration was done. The pool is not heated and is only set up for 4-5 months, of which maybe 2 months have temperatures above 20 degrees. With you, the water is always in the pool. I can imagine that with continuous use (frame pool with sand filter) the water turns green or causes diarrhea.

Anyway, I'm looking forward to when the pool is set up again. I use it daily. The next one will be a bit bigger. Then hopefully the little one can swim.

The strips or shake test are not reliable and, for example, do not show free chlorine or even the redox value. If the pool is often covered, it is also less problematic. If biomass enters, problems can occur. If you have no problems, that is good. Unfortunately, many have problems precisely because of the undersized technology. Today I opened the pool and threw in the Riboter.

He is covered because of the liability.
Bio stuff is being fished out.

He only stands briefly compared to yours. That must not be forgotten