Aside from not having to put chlorine in the water, the same things that you have to do in a fresh water pool.
A salt system IS a chlorine system. Chlorine is still the sanitizer. The salt system is there so a chlorine generator can make the chlorine from the salt instead of you having to deal with it. There is no such thing as "best", only tradeoffs. A salt system is expensive even if you break it down per year (with initial and replacement costs). However much less maintenance. A salt system IS perfectly safe for a vinyl, or any type, pool.
It depends how many gallons your pool is. Once you buy your chlorinating system, the install manual will tell you how much salt to add based on how many gallons in the pool. I have an Autopilot Digital and it tells me when it needs salt. I still check it with test strips to be safe.
Are you using iodized salt or pool salt? I've read that the iodine in the iodized salt will leave yellow staining in the pool.
Both require the same maintenance.
same as any other pool
I have a fresh water pool that I am thinking of converting to a Salt Water system. My neighbors tell me that they have little or no maintenance with their Salt system. The question I have is if I convert to a salt system why do I have to spend $1,000 on a Chlorine Generator.? If I add the salt, to change the softness and control the Algae then instead of purchasing a Chlorine Generator and paying the electricity costs why don't I just use my present automatic chlorinator with Chlorine Tablets? After a process called electrolysis is using the box of electronics breaks down the salt in the salt water In a salt system the electronic box is connected to the electrodes in the "Cell". So my point is that instead of generating chlorine from salt why don't I just add it like I don now with my fresh water system..
two or three days a week
Salt pools still require weekly shock maintenance, but not near the amount that a chlorine pool would need. There are Salt Pool Shock Treatments out there for your particular pool setup.
No pool is maintenance free. There are options like, salt chlorine systems and automatic cleaners that help to reduce the maintenance but nothing is or should be free of maintenance.
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No A salt water pool is in fact also chlorine pool, the difference being that with a salt water pool a salt water chlorinator converts the salt that is in the water into chlorine gas which is then dissolved into the water while the filter is running. the conversion wont have any adverse effects on the pool.
Most pool shops carry it and some department stores and hardwares