I can't get my water to ph down like normal. A few years on my system well water filter salt softener then three filter drink water drip float into five gallon buckets two and then I ph down normally minimal amounts of crystals down salt and stir and check. But I've been dumping tons of crystals down and ph barely moving. I thought my salt went bad so I bought new one but same issue. I also told co. But no response. It acts like my water is locked out chemically strange to me. I also ordered a liquid ph down to try different type. Thanks for any help. I'm struggling to get my plants watered because I can't ph water. Why isn't ph down Crystal working like normal?