When is "Perfect for a swim!" displayed?

This screen will display when there is no active recommendation. Even if the chlorine or alkalinity is higher than the recommended range. We understand this is confusing and we are planning a solution to make this much easier to understand, but it will take time to get it just right.

Even if the app says "Perfect for a swim!" we suggest looking at the readings the monitor most recently took. If you added chemicals and your last reading was less than 8 hours ago, then you will need to wait for the next reading to come in 8 hours after the previous.

My free chlorine is high, what should I do?

Even if we recommend to not exceed 3 ppm of chlorine, no harm is done under 10 ppm. However, if you want to reduce your chlorine there are some options on how to handle this situation.

1. Take off the pool/spa cover during the day and adjust future chlorine additions. Wait until chlorine dissipates naturally.
2. If you use an automatic feeder, tablet floater, or salt water generator consider adjusting the output when chlorine demand is low.
3. Use a chlorine remover. There are chemicals on the market that are made to remove chlorine from the pool/spa. However, we do not recommend their use normally. It is much too easy to accidentally remove all the chlorine in the water, then needing to add it back to the water. This is not cost effective and could become a larger issue if algae or bacteria start to grow while the water is vulnerable.

My total alkalinity is high, what should I do?

There is a method to lowering the total alkalinity. But remember, that the pH and alkalinity are tied together.

First, determine if there is an issue:

• Is the water cloudy or dull looking?
• Did you calculate your CSI (calcium saturation index) and determine you need to lower the total alkalinity?
• Are you constantly battling the pH rising?

These are all the issues related to high alkalinity. If you do not have any of these issues, it is likely perfectly fine for your alkalinity to be on the higher side. Every reading doesn't have to be perfect for a good swim or soak.

Second, decide on how to solve the issue:

• DIY fast: do you want to learn how and take full control of your pool as fast as possible? We do not recommend allowing swimmers in the pool until the pH is returned to normal.
• DIY relaxed: do you have no major issue, but you want to go in the right direction? During this method it is okay to allow swimming when you normally would.

DIY fast

1. Locate the return jets for your pool or spa. Water features such as waterfalls or fountains also work well. Return jets should be pointed upward so that the water surface is broken while the pump is running.
   Running water features or returns to break the water surface helps add air to the pool. This is what will be removing the alkalinity from the pool.
2. Lower the pH to 6.5-6.8. This will depend on your test kit, the Sutro Monitor will read the pH down to at least 6.8.
   Run the pool pump and water features normally, or for extra time to speed up the process.
3. The pH will slowly raise as the water is aerated.
4. Continue to monitor the pH and total alkalinity, if the pH goes above 7.0 and the total alkalinity still needs to be decreased by over 100 ppm, lower the pH back down to 6.5-6.8.
5. Once the desired total alkalinity is reached, re-adjust the pH to 7.4-7.6. Adjusting the pH up will increase the alkalinity slightly, but not put it out of range again.

DIY relaxed

This is a similar process to the "fast" version. However, the pH is not lowered as drastically. This should take approximately 10 times slower but you can maintain a more neutral pH.

1. Locate the return jets for your pool or spa. Water features such as waterfalls or fountains also work well. Return jets should be pointed upward so that the water surface is broken while the pump is running.
   Running water features or returns to break the water surface helps add air to the pool. This is what will be removing the alkalinity from the pool.
2. Lower the pH to 6.8-7.0. This will depend on your test kit, the Sutro Monitor will read the pH down to at least 6.8.
   Run the pool pump and water features normally, or for extra time to speed up the process.
3. The pH will slowly raise as the water is aerated.
4. Continue to monitor the pH and total alkalinity, if the pH goes above 7.0 and the total alkalinity still needs to be decreased by over 100 ppm, lower the pH back down to 6.8-7.0.
5. Once the desired total alkalinity is reached, re-adjust the pH to 7.4-7.6. Adjusting the pH up will increase the alkalinity slightly, but not put it out of range again.

Need help?

Please reach out to customer support if you need  help with this process.