I would imagine that everyone's well water is different. We filled ours from our well using a prefilter that atttaches to your hose. After 2 weeks we had to change our water because of high TDS. We then tested our well water finding that it is also very high in TDS. So we brought water in and it is amazing the difference in how clear the water looks. Our well water started off cloudy. So, it may be a good idea to bring your well water in and have it tested. We brought ours to a Beachcomber dealer who is equipped to do a huge variety of tests including TDS and calcium, ph, alk,..... You will then have a base to go by and an explanation as to why your spa water may be out of wack.