"Snotty white stuff" is probably what gets called "water mold"; it doesn't come from sand, but the bacteria could be growing there. It typically takes fairly aggressive treatment to eradicate . . . and is a FANTASTIC opportunity for you to get "pool-stored", ie, sold a BUNCH of expensive stuff that may, or may not help.
To fix it, we need to go in 4 steps:
1. Stop it from getting worse.
2. Find out about your pool (Pool Chart & test kit)
3. Work out a plan.
4. Follow the plan.
Ok, here we go.
1. Assuming you have a chlorinated pool, and do NOT have a bunch of copper in your water, do all this:
+ Add 1 gallon of PLAIN 6% (check the %) household bleach PER 10,000 gallons of pool water to your pool EVERY evening, starting this evening
+ If it's not already, start running your pump 24/7.
+ Adjust your pH to between 7 and 8, if it's not already there.
2. Fill out the Pool Chart; get a test kit (links & info below) and give us test results on your pool AND your fill water.Pool Chart Entry Form3. We'll work out the plan, after we have the info from #2.
4. Then, stick to the plan . . . and do NOT buy or add any pool store goop!
Ben
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+ Get a cheap OTO (yellow drops) / phenol test kit, or if available at YOUR Walmart (check availability), get the HTH 6-way DROPS test kit, which is compatible with the Taylor K2006. Test the pool as soon and you can, and post the results. If you get the 6-way kit, ALSO test the water you FILL the pool with, especially if it's a well, and post THOSE results as well. (The HTH is the best available kit you're likely to find locally, but it's not the K-2006. It can only provide rough measurements chlorine levels above 5 ppm, and it measures "TOTAL" hardness, rather than "CALCIUM" hardness, which is not ideal.)
+ Having a good test kit makes pool care easier for EVERYONE, but is an ESSENTIAL tool for pools with problems. A good test kit means a kit that can test chlorine from 0 - 25 ppm, pH, alkalinity, calcium hardness, and stabilizer with reasonable accuracy. Test strips (AKA 'guess-strips' ) do NOT meet this standard. Some pool store testing is accurate; most is not. The ONLY way you'll know whether your pool store is accurate or bogus, is by testing accurately your own self. On the other hand, pool store 'computer' dosing recommendations are NEVER trustworthy -- ignore them. They are designed to sell more chemicals than you need, and WILL cause many pool problems.
+ We recommend the Taylor K-2006 test kit, which meets the requirements above, for many reasons. The HTH 6-way drops kit is a great starter kit, and is compatible with the K2006 (it's made by Taylor). There are a few alternatives; for example Lamotte makes an FAS-DPD kit that's OK -- but it costs 3x as much. But, we're not aware of any test that is better, and since we are all familiar with the K-2006 (and can help you with it) we recommend it exclusively ( Test kit info page )
One caution for the 2012 season: Amazon does not stock the kits directly. So when buying at Amazon, Amato is our current preferred seller. However, they often don't list enough stock to last the whole day, so try order mid-morning. You should expect a delivered cost under $60 for the K2006A and under $95 for the K2006C. If you can't find that, wait a day.
+ Here are links to the kits we recommend (you can check local availability on the HTH kit, using the Walmart link):HTH 6-Way Test Kit @ Walmart
Taylor K2006A (3/4 oz bottles) @ Amazon
Taylor K2006C (2 oz bottles) @ Amazon
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