Filter

[milly3]

what position do I face the pool filter when I add my pH down chemical

 

[Texas Splash]

Welcome to TFP! If you have a sand or DE filter with a multiport valve, the most important thing is that water is moving to the pool for good circulation. You can place the multiport handle on FILTER or RECIRCULATE which will allow water to move to the pool. Just be sure to NOT pour any products directly into the skimmer.

Is that what you were asking?

 

[Texas Splash]

The article below addresses all TFP recommended chemicals and how they should be added to the pool.

Recommended Pool Chemicals

Which should I buy? TFP's recommended pool chemicals are cheap, easy, and won't unbalance your pool water.

www.troublefreepool.com

 

[drsipe]

pH – Acidity/Alkalinity​

Lowering pH​

To lower pH, you can use either muriatic acid or dry acid. Muriatic acid is less expensive, though it requires more careful handling. It is best to use muriatic acid if you have a SWG. If you don’t have a SWG, and handling muriatic acid bothers you, you can use dry acid.


Muriatic acid is sold by most hardware stores and some paint stores. The big box hardware stores, like Home Depot and Lowes, almost always have it, but they seem to put it in different departments from store to store. Sometimes it is outside in the garden department, sometimes in pool supplies, and sometimes in the paint department.

Muriatic acid is available in various strengths. The most common strength is called either 20° baume or 31.45%. 10° baume or 15.725% is easier to handle but you need twice as much and it is usually more expensive.

You should always wear eye protection when handling muriatic acid. You do not want to breathe muriatic acid fumes. If you spill any on your clothes it will cause damage. Muriatic acid may sting a bit if you get it on your skin, but won’t normally cause any serious harm as long as you rinse it off right away.

Muriatic acid should be added to the pool by pouring slowly in front of a return jet with the pump running. You should pour slowly enough that pouring an entire jug takes more than two minutes. Leave the pump running for at least 30 minutes after adding muriatic acid.

Dry acid is sold by pool stores and the pool departments of some big box stores. Dry acid is sold under various names, including PH Down, PH Reducer, PH Decreaser, Lo-n-Slo, etc. Dry acid is best added by pre-dissolving it in a bucket of water and then pouring that slowly in front of a return.