Mine is an above ground pool partly set in ground. The pump has been submerged while running a few times and survived. The side wall recently rusted through & collapsed but a secondhand pool from Gumtree and a new liner and it was back in use again. The pump seized while the liner was being replaced so attacked it with an impact driver which freed it, guessed I'd have to replace the pump but no, after welding a new baseplate (old one had rusted off) it's been fine.
I've had an 'ionic generator' on my current pool and the one at our last house. 
Two electrodes made from copper & silver are in a housing in the flow from the pump. A control box alternates the polarity to the electrodes (so that they wear evenly).
As the copper and silver ions try to transfer to the opposite electrode they are washed away into the pool by the flow. Copper kills algae and silver kills bacteria.
You do need to add chlorine occasionally to oxidise & burn off 'swimmer wastes' (spit, sweat, makeup etc.).
Worked perfectly at the old house and for over 10 years at the current house then had a few problems with algae. Recently removed the control box and dropped it off to a mate who discovered a relay had failed so wasn't working properly. Just got a call today to say it's fixed !
I do remember that when the pool shop tested the water they would check the copper content because too high and the kids hair would turn green. That would be funny, but SWMBO wouldn't be impressed.
Mostly I've maintained the pool using the test facility at Bunnings in recent years. Using a pool shop always seemed expensive... 10Kg of this, that upsets the balance of that so another 5kgs of something else, that causes this so another 2 kg of .............. etc.etc.
Colin
				
			 
			
		 
			
				
			
			
				'56 Series 1 with homemade welder
'65 Series IIa Dormobile
'70 SIIa GS
'76 SIII 88" (Isuzu C240)
'81 SIII FFR
'95 Defender Tanami
Motorcycles :-
Vincent Rapide, Panther M100, Norton BIG4, Electra & Navigator, Matchless G80C, Suzuki SV650
			
			
		 
	
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