I have an approximately 10 year old, acrylic shell, spa that I have maintained fairly well over the years. Here is my situation that I'm hoping someone can help me with. I change the water (City water, not well water. ) about twice per year and did one about a week ago. After this change my tub's surface was completely covered with this fine, light gray colored sediment. After this refill, I accidentally used my bad batch of chlorine that was not dissolving before I realized it was my bad batch that I forgot to dispose of. (Apparently it got wet and had some chemical reaction and was no longer dissolving in water). I donâ€™t know if the bad chlorine had anything to do with my sediment problem but maybe it did. It happened once before after a refill when I used one of those filters, that someone gave me, that attached to the garden hose. I figured in that case I was getting sediment from the filter and never used it again. I have refilled several times after that incident and have had a bit of this sediment after draining that I shop-vac out as best I can. I have never been able to completely get rid of the sediment but it has been minimal until this last re-fill. This time, while filled, I used a soft bristle bush to brush the sediment off the surface which clouded the water and then after settling for a few hours, left the water perfectly clear and the sediment in piles at the bottom of the spa. Is it possible that the pipes have a large amount of this sediment in them and somehow I released a large amount into my tub this time? If so, how do I remove the sediment from the plumbing PVC pipes? Or, could it be something else that's happening? Iâ€™m planning on changing the water again to remove the sediment from the tub but want to avoid this from happening again. I donâ€™t use any kind of water treatment that is used for water hardness and I donâ€™t believe it is sediment from the tap water. Itâ€™s too extreme. Thereâ€™s a lot of it. Any help, theories or suggestions is greatly appreciated.
Tested water with TDS meter. From spa: 437. From hose where I filled from: 402