Pool Basics 2804PB Calcium Hardness Increaser for Pools, 4-Pound
</br></br>
<div style="text-align:left">
<b>[Product Information]</b><br>
<ul>
<li>A low calcium hardness level can cause corrosive water</li>
<li>Protects plumbing and heater</li>
<li>Prevents the staining or etching of your pool's surface</li>
</ul>
</div>
</br></br></br></br></br></br></br></br></br></br>

</br></br></br></br></br></br></br></br></br></br>
<img src='//agdetail.image-gmkt.com/m430/985/885/840885985/img/agdetail.image-gmkt.com/985/885/840885985/img/ecx.images-amazon.com/images/I/416fRVVWwuL.jpg'></br>